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SM5302A
3-channel Video Buffer with Built-in wideband LPF
OVERVIEW
The SM5302A is a 3-channel video buffer with built-in 5th-order lowpass filters. The lowpass filter cutoff frequency range can be linearly controlled from 4.8MHz to 43MHz*1. The lowpass filter supports 480i to 1080i format, video signal equipment analog input/outputs. For video input systems, the device functions as a nextstage ADC system anti-aliasing filter. For video output systems, the filter removes video DAC aliasing and external noise and can drive a maximum of two 75 terminated loads. The cutoff frequency, signal input type, and output gain switching can be controlled using an I2C*2 control bus, and the I2C slave address can be set by ADS (3-state input) to allow a maximum of three devices to be used simultaneously.
*1. When the resistor connected to ISET (RISET) is 1.8k. *2. I2C BUS is a registered trademark of Philips Electronics N.V.
FEATURES
I
PINOUT
(Top view)
I
I
I I I I I I I I
I I
Supply voltages * Analog: 4.75 to 5.25V * Digital: 3.0 to 5.5V Lowpass filter with linearly adjustable cutoff frequency (256 values) * Cutoff frequency range: 4.8MHz to 43MHz (RISET = 1.8k) Filter bypass mode function for display specifications up to SXGA resolution * Passband: 80MHz (typ) Half fc mode switch function (CH-2, CH-3) suitable for digital component signals 2-system input multiplexer function (switchable using I2C or MUXSEL input) Video input pins can be independently set to synctip clamp/bias/direct inputs Maximum two 75 terminated load drive capability Output gain switching: 0dB/6dB Disable function * 300A current consumption when disabled Output sag compensation circuit built-in I2C interface control * Slave address: 90h, 92h, or 94h (up to three devices can be used simultaneously, selected by ADS input) * Data transfer rate: Fast mode (up to 400kbit/s) Operating ambient temperature range: 0 to 70C Package: 28-pin HSOP
REF1 1 VDD 2 SDA 3 SCL 4 VSS 5 MUXSEL 6 ADS 7
28 REF2 27 REF3 26 VCC1 25 OUT1A 24 OUT1B 23 GND1 22 VCC2
IN1A 8 IN1B 9 ISET 10 IN2A 11 IN2B 12 IN3A 13 IN3B 14
21 OUT2A 20 OUT2B 19 GND2 18 VCC3 17 OUT3A 16 OUT3B 15 GND3
PACKAGE DIMENSIONS
(Unit: mm)
+ 0. 0.15 - 0. 1 05
7.5 0.2
I I I I
HDTVs LCD TVs PDPs Projectors
1.3TYP 18.6 0.3
2.2 0.1
0 to 10
5.15
0.10 0.35 0.05
0.12 M
Device SM5302AS
Package 28-pin HSOP
NIPPON PRECISION CIRCUITS INC.--1
0.1 0.05
ORDERING INFORMATION
0.8
0.5 0.2
APPLICATIONS
9.9 0.3
SM5302A
BLOCK DIAGRAM
VDD
VSS
ADS MUXSEL
ISET REF1
SDA SCL
I 2C Control
Vref Current Source
REF2 REF3
Bypass 0dB/6dB IN1A IN1B
Clamp/Bias/Direct MUX Clamp/Bias/Direct
VCC1 OUT1A
5th Order LPF (Standard fc)
Filter OUT1B GND1
CH-1
Bypass 0dB/6dB IN2A IN2B
Clamp/Bias/Direct MUX Clamp/Bias/Direct
VCC2 OUT2A
5th Order LPF (Standard /Half fc)
Filter OUT2B GND2
CH-2
Bypass 0dB/6dB IN3A IN3B
Clamp/Bias/Direct MUX Clamp/Bias/Direct
VCC3 OUT3A
5th Order LPF (Standard /Half fc)
Filter OUT3B GND3
CH-3
Note. The recommended value of the external resistor connected to ISET is 1.8k.
NIPPON PRECISION CIRCUITS INC.--2
SM5302A
PIN DESCRIPTION
Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 *1. I: input, O: output *2. A: analog, D: digital Name REF1 VDD SDA SCL VSS MUXSEL ADS IN1A IN1B ISET IN2A IN2B IN3A IN3B GND3 OUT3B OUT3A VCC3 GND2 OUT2B OUT2A VCC2 GND1 OUT1B OUT1A VCC1 REF3 REF2 I/O*1 O A/D*2 A D D D D D D A A A A A A A A A A A A A A A A A A A A A Internal reference voltage 1 Digital supply (3.0 to 5.5V) I2C data signal input/output I2C clock signal input Digital ground Input multiplexer switch control I2C slave address select (3-state input) Video signal input (CH-1, input A) Video signal input (CH-1, input B) Internal current-setting resistor (RISET) connection (standard 1.8k) Video signal input (CH-2, input A) Video signal input (CH-2, input B) Video signal input (CH-3, input A) Video signal input (CH-3, input B) Analog ground (CH-3) Video signal output (CH-3, for sag compensation) Video signal output (CH-3) Analog supply (CH-3) (4.75 to 5.25V) Analog ground (CH-2) Video signal output (CH-2, for sag compensation) Video signal output (CH-2) Analog supply (CH-2) (4.75 to 5.25V) Analog ground (CH-1, Vref) Video signal output (CH-1, for sag compensation) Video signal output (CH-1) Analog supply (CH-1, Vref) (4.75 to 5.25V) Internal reference voltage 3 Internal reference voltage 2 Description
-
I/O I
-
I I I I
-
I I I I
-
O O
- -
O O
- -
O O
-
O O
NIPPON PRECISION CIRCUITS INC.--3
SM5302A
PIN EQUIVALENT CIRCUITS
Number Name I/O Equivalent circuit
VCCn
8 9 11 12 13 14
IN1A IN1B IN2A IN2B IN3A IN3B
I
INnA INnB
GNDn
VCCn
OUTnA
25 26 21 20 17 16
OUT1A OUT1B OUT2A OUT2B OUT3A OUT3B
O
GNDn 750 VCCn
OUTnB
GNDn
VCC1
1
REF1
O
REF1
GND1
NIPPON PRECISION CIRCUITS INC.--4
SM5302A
Number Name I/O Equivalent circuit
VCC1
REF2
28 27
REF2 REF3
O
GND1 VCC1
REF3
GND1
VDD
3
SDA
I/O
250 SDA
VSS
VDD
4 6
SCL MUXSEL
I
SCL MUXSEL
180
VSS
VDD
7
ADS
I
250 ADS
VSS
Note. Resistance values indicate design values.
NIPPON PRECISION CIRCUITS INC.--5
SM5302A
SPECIFICATIONS
Absolute Maximum Ratings
VSS = GND1 = GND2 = GND3 = 0V, VCC1 = VCC2 = VCC3 = VDD = VCC
Parameter Supply voltage Input voltage Storage temperature range Power dissipation Junction temperature Symbol VCC VIN TSTG PD TJ ja = 60C/W Note. ja is the measured quantity under the mounted condition which NPC specified. Condition VCC1, VCC2, VCC3, VDD MUXSEL, ADS, SDA, SCL, INnA, INnB (n = 1, 2, 3) Rating - 0.3 to 7.0 GND - 0.3 to VCC + 0.3 - 55 to + 125 1.0 125 Unit V V C W C
Recommended Operating Conditions
Parameter Supply voltage 1 Supply voltage difference Supply voltage 2 Operating ambient temperature Symbol VCC VCC VDD Ta Condition VCC1, VCC2, VCC3 VCC1 - VCC2, VCC1 - VCC3, VCC2 - VCC3 VDD Rating 4.75 to 5.25 0.1 3.0 to 5.5 0 to 70 Unit V V V C
Note. VCC1 to VCC3 should be applied simultaneously.
Electrical Characteristics
DC Characteristics VCC = 5.0V, VDD = 3.0 to 5.5V, Ta = 25C, fin = 100kHz, VIN = 1.0Vp-p, RISET = 1.8k, RL = 75, CH-1 set to clamp input, CH-2 and CH-3 set to bias input, FCDATA = 227, unless otherwise noted.
Rating Parameter Current consumption 1*1 Current consumption 2*1 Current consumption 3*1 Current consumption 4*1 HIGH-level input voltage LOW-level Input voltage ADS HIGH-level input voltage ADS LOW-level input voltage ADS open-circuit input voltage LOW-level input leakage current HIGH-level input leakage current SDA output voltage Symbol ICC1 ICC2 ICC3 ICC4 VIH1 VIL1 VIH2 VIL2 VOPEN ILL ILH VOL Condition min Filter mode, FCDATA = 255 Filter bypass mode Power-down mode, 3-address mode Power-down mode , 2-address mode SDA, SCL, MUXSEL, Ta = 0 to 70C SDA, SCL, MUXSEL, Ta = 0 to 70C ADS, Ta = 0 to 70C ADS, Ta = 0 to 70C ADS, Ta = 0 to 70C SDA, SCL, MUXSEL, VIN = 0V SDA, SCL, MUXSEL, VIN = VDD Sink current = 3mA SDA = LOW output - - - - 0.7 VDD - 0.8 VDD - VDD/2 - 0.2 - - 0 typ 130 85 - - - - - - - - - - max 155 110 300 250 - 0.3 VDD - 0.2 VDD VDD/2 + 0.2 1.0 1.0 0.4 mA mA A A V V V V V A A V Unit Test level I I I I I I I I I I I I
*1. Sum of VCC1 + VCC2 + VCC3 + VDD. No input signals. NIPPON PRECISION CIRCUITS INC.--6
SM5302A AC Characteristics (I2C) VCC = 5.0V, VDD = 3.0 to 5.5V, Ta = 25C, unless otherwise noted.
Rating Parameter SCL clock frequency SCL hold time (start condition) SCL clock LOW-level pulsewidth SCL clock HIGH-level pulsewidth SCL setup time (start condition) SDA data hold time SDA data setup time SDA, SCL rise time SDA, SCL fall time SCL setup time (stop condition) SDA, SCL input capacitance Symbol fSCL tHD;STA tLOW tHIGH tSU;STA tHD;DAT tSU;DAT tr tf tSU;STO Ci Condition min 0 0.6 1.3 0.6 0.6 0.15*1 100 - - 0.6 - typ - - - - - - - - - - - max 400 - - - - 0.9 - 300 300 - 10 kHz s s s s s ns ns ns s pF Unit Test level II II II II II II II II II II II
*1. This value is not conforming to the I2C BUS specification established by Philips Corporation.
SDA
tf
tLOW
tr
tr
tSU;DAT tf
tBUF
tHD;STA
SCL
tHD;STA
tHD;DAT
tHIGH
tSU;STA
tSU;STO
S
Sr
P
NIPPON PRECISION CIRCUITS INC.--7
SM5302A Analog Characteristics
Analog input characteristics
VCC = 5.0V, VDD = 3.0 to 5.5V, Ta = 25C, fin = 100kHz, VIN = 1.0Vp-p, RISET = 1.8k, RL = 75, CH-1 set to clamp input, CH-2 and CH-3 set to bias input, FCDATA = 227, unless otherwise noted. Internal mode settings are shown in table 1 in "Mode Condition Settings".
Rating Parameter Clamp voltage Bias voltage Input resistance Symbol VCLMP VBIAS RBIAS VAI1 Filter mode maximum input voltage VAI2 VAI3 VAI4 VAI5 Bias mode maximum input voltage VAI6 VAI7 VAI8 VIDC1 VIDC2 VIDC3 VIDC4 Clamp input Bias input Bias input Mode: b0 (bias, 0dB), THD < 1.0% Mode: b6 (bias, 6dB), THD < 1.0% Mode: c0 (clamp, 0dB), THD < 1.0% Mode: c6 (clamp, 6dB), THD < 1.5% Mode: f0 (bias, 0dB), THD < 1.0% Mode: f6 (bias, 6dB), THD < 1.5% Mode: g0 (clamp, 0dB), THD < 1.0% Mode: g6 (clamp, 6dB), THD < 1.5% Mode: h0 , THD < 1.5%, VIN < 1.4Vp-p Mode: h6, THD < 1.5%, VIN < 1.2Vp-p Mode: j0 , THD < 1.5%, VIN < 1.4Vp-p Mode: j6, THD < 1.5%, VIN < 1.2Vp-p Condition min 1.8 2.2 - 1.4 1.4 1.4 1.0 1.4 1.2 1.4 1.0 1.5 1.7 1.1 1.4 typ 2.0 2.4 20 - - - - - - - - - - - - max 2.2 2.6 - - - - - - - - - 3.5 3.0 3.3 2.9 V V k Vp-p Vp-p Vp-p Vp-p Vp-p Vp-p Vp-p Vp-p V V V V Unit Test level I I II I I I I I I I I I I I I
Direct mode input DC voltage range
NIPPON PRECISION CIRCUITS INC.--8
SM5302A
Filter mode and bypass mode frequency characteristics
VCC = 5.0V, VDD = 3.0 to 5.5V, Ta = 25C, fin = 100kHz, VIN = 1.0Vp-p, RISET = 1.8k, RL = 75, CH-1 set to clamp input, CH-2 and CH-3 set to bias input, FCDATA = 227, unless otherwise noted.
Rating Parameter Symbol FC1 Cutoff frequency FC2 FC3 FC4 Half fc mode cutoff frequency ratio 4fc attenuation Filter bypass mode passband Rhalf1 Rhalf2 GSB FBP FCDATA = 0 FCDATA = 10 FCDATA = 227 FCDATA = 255 Half fc mode, FCDATA = 10 Half fc mode, FCDATA = 227 fin 4fc, attenuation from fin = 100kHz VIN = 0.7Vp-p, Gain = - 1dB Condition min - 5.98 32.5 - 44 49 - 68 typ 4.74 6.79 36.89 43.73 49 54 50 80 max - 7.60 41.3 - 54 59 - - MHz MHz MHz MHz % % dB MHz Unit Test level II I I II I I II I
Analog output characteristics
VCC = 5.0V, VDD = 3.0 to 5.5V, Ta = 25C, fin = 100kHz, VIN = 1.0Vp-p, RISET = 1.8k, RL = 75, CH-1 set to clamp input, CH-2 and CH-3 set to bias input, FCDATA = 227, unless otherwise noted. Internal mode settings are shown in table 1 in "Mode Condition Settings".
Rating Parameter Symbol AVF1 AVF2 Filter bypass mode output gain AVB1 AVB2 Filter bypass mode gain error Channel to channel gain error Maximum output voltage dAVBP dAVCH Vout1 Vout2 THDB1 Output distortion THDB2 THDC1 THDC2 Channel to channel crosstalk MUX input to input crosstalk Drive load resistance I2C response time MUXSEL switch response time XTLK1 XTLK2 RL TIC TMS Mode: b0, c0 (0dB), THD < 1.0% Mode: b6, c6 (6dB), THD < 1.5% Mode: b0, fin = 1kHz, VIN = 1.4Vp-p Mode: b6, fin = 1kHz, VIN = 1.2Vp-p Mode: c0, fin = 1kHz, VIN = 1.4Vp-p Mode: c6, fin = 1kHz, VIN = 1.0Vp-p 0.5Vp-p input, fin = 1MHz, between 2 channels 0.5Vp-p input, fin = 1MHz, between INnA-INnB, 6dB 1 load = 150 Response time from ACK bit output when changing I2C settings Response time at L H, H L Gain = 0dB Gain = 6dB Gain = 0dB Gain = 6dB Gain error between filter mode and bypass mode Condition min Filter mode output gain - 0.5 5.5 - 0.5 5.5 - - 1.4 2.4 - - - - - - - - - typ 0 6.0 0 6.0 0.2 - - - 0.2 0.2 0.2 0.5 - 71 - 50 - - - max 0.5 6.5 0.5 6.5 - 0.2 - - 1.0 1.0 1.0 1.5 - - 2 1 1 dB dB dB dB dB dB Vp-p Vp-p % % % % dB dB load s s Unit Test level I I I I I I I I I I I I II II I II II
NIPPON PRECISION CIRCUITS INC.--9
SM5302A
Reference Voltage Characteristics (REF)
VCC = 5.0V, VDD = 3.0 to 5.5V, Ta = 25C, unless otherwise noted.
Rating Parameter Symbol VR1 REF output voltage VR2 VR3 REF1 REF2 REF3 Condition min - - - typ 2.45 2.65 1.90 max - - - V V V Unit Test level II II II
Test level I : 100% of products tested at Ta = + 25C. II : Guaranteed as result of design and characteristics evaluation. Mode Condition Settings
Table 1. Mode settings
Input type Mode setting CH-1 a0 Clamp a6 b0 Bias b6 c0 Clamp c6 d0 Bias d6 e0 Clamp e6 f0 Bias f6 g0 Clamp g6 h0 h6 i0 Direct i6 j0 j6 6dB 0dB 6dB - Bypass 6dB 0dB Standard 6dB Filter 0dB Half 6dB 0dB - Bypass 6dB 0dB 6dB Half 0dB 6dB 0dB 6dB 0dB Filter Bias Bias 6dB 0dB Standard CH-2 CH-3 0dB Output gain fc mode Filter/Bypass mode
NIPPON PRECISION CIRCUITS INC.--10
SM5302A Evaluation Circuit Diagram
I 2C Controller
+
+
+
+
+
10 REF1 VDD SDA SCL VSS MUXSEL ADS 4.7
+
10
10 REF2 REF3 VCC1
100
0.1
100
+
75
75
OUT1A OUT1B GND1 VCC2
4.7
+
100
+
75 Output 75
4.7
+
IN1A IN1B
OUT2A OUT2B GND2 VCC3 OUT3A OUT3B GND3 100
+
Input 4.7
+
ISET IN2A IN2B 4.7
+
IN3A IN3B
75
4.7
+
75 RISET = 1.8k
Note. This is the electrical characteristics evaluation circuit only, then it is not a recommended application circuit.
NIPPON PRECISION CIRCUITS INC.--11
SM5302A
FUNCTIONAL DESCRIPTION
I2C BUS Control
The SM5302A uses an I2C BUS interface to set the following functions. 1) 2) 3) 4) 5) 6) 7) 8) Cutoff frequency Output gain fc mode switching (1/2 cutoff frequency switching) Filter mode/filter bypass mode switching Input multiplexer selection Input type switching (sync-tip clamp, bias, direct) Disable function Maximum number of slave addresses
It supports fast-mode data transfer rate (up to 400kbit/s). Note that the SM5302A does not have a read function (IC is write only). Basic cycle
SDA
SCL
Start condition
Stop condition
I2C start/stop condition The basic access cycle comprises the following elements. 1) 2) 3) 4) 5) Start condition 1st byte: Slave address 2nd byte: Subaddress 3rd byte: Control data Stop condition
If the input data does not match the slave address or the subaddress is incorrect, the corresponding ACK (acknowledge) bit is not output LOW. However, the ACK bit is output after 3rd byte irrespective of the byte data. Also note that the IC does not have a subaddress auto-increment function, hence each subaddress access requires all the basic cycle steps 1 to 5.
Start
1st byte:Slave address
2nd byte:Subaddress
3rd byte:Control data
Stop
SDA
D7
D6
D1
D0 Low
ACK
D7
D6
D1
D0
ACK
D7
D6
D1
D0
ACK
SCL
1 2 7 8 9 1 2 7 8 9 1 2 7 8 9
NIPPON PRECISION CIRCUITS INC.--12
SM5302A 1st byte: slave address The ADS pin can set one of three slave addresses. Note that D0 must be "0 (Write)".
1st byte: slave address ADS HEX L H Open*1 *1. 90h 92h 94h D7 1 1 1 D6 0 0 0 D5 0 0 0 D4 1 1 1 D3 0 0 0 D2 0 0 1 D1 0 1 0 D0 0 (W) 0 (W) 0 (W)
When ADS is open (94h), I2C control may not be able to set the address. See "P16. (8) Maximum number of slave addresses."
2nd byte: subaddress The 2nd byte sets the subaddress, selecting one of three registers.
2nd byte: subaddress Register name HEX FCSET CONDITION1 CONDITION2 01h 02h 03h D7 0 0 0 D6 0 0 0 D5 0 0 0 D4 0 0 0 D3 0 0 0 D2 0 0 0 D1 0 1 1 D0 1 0 1
3rd byte: control data The 3rd byte control data sets the register flags corresponding to the subaddress selected by 2nd byte. The flags assigned are shown in the following table.
3rd byte: control data Register name D7 FCSET CONDITION1 CONDITION2 FCM CB5 PD D6 FC6 CB4 MUX D5 FC5 CB3 HALF D4 FC4 CB2 BYPASS D3 FC3 CB1 - D2 FC2 CB0 NCA D1 FC1 - - D0 FC0 GS -
NIPPON PRECISION CIRCUITS INC.--13
SM5302A Flag settings (1) Cutoff frequency Register name: FCSET Flag names: FCM, FC [6:0] The FCSET register setting sets the cutoff frequency using one of two tuning adjustment functions, thus a total of 256 values are possible. The cutoff frequency is determined by the following equations. The values are shown in "Lowpass Filter". * FCDATA = 0 to 127 : fc = k11 x FCDATA2 + k12 x FCDATA + k13 [MHz] * FCDATA = 128 to 255: fc = k21 x FCDATA2 + k22 x FCDATA + k23 [MHz] The coefficients when RISET = 1.8k are: * k11 = - 1.95e - 4, k12 = 2.07e - 1, k13 = 4.74 * k21 = - 3.92e - 4, k22 = 4.33e - 1, k23 = - 41.2
Flag name FCDATA 0 1 2 FCSET FCM 00h 01h 02h 0 0 0 FC6 0 0 0 : 125 126 127 128 129 130 7Dh 7Eh 7Fh 80h 81h 82h 0 0 0 1 1 1 1 1 1 0 0 0 : 253 254 255 FDh FEh FFh 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 1 1 1 0 1 43.26 43.49 43.73 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 0 0 0 0 1 1 0 0 1 1 0 1 0 1 0 27.57 27.73 27.88 7.80 8.13 8.47 FC5 0 0 0 FC4 0 0 0 FC3 0 0 0 FC2 0 0 0 FC1 0 0 1 FC0 0 1 0 Cutoff frequency [MHz] 4.74 4.95 5.15 Default
(2) Input type switching (sync-tip clamp, bias, direct) Register name: CONDITION1 Flag names: CB [5:4], CB [3:2], CB [1:0] These flags set the input type of CH-1, CH-2, and CH-3 to one of three types: sync-tip clamp input, bias input, or direct input.
Channel CH-1 CH-2 CH-3 CB5 CB3 CB1 L L H Flag name CB4 CB2 CB0 L H Don't care Input type Default
Sync-tip clamp input Bias input Direct input*1
*1. An input coupling capacitor should not be connected when direct input is selected.
NIPPON PRECISION CIRCUITS INC.--14
SM5302A (3) Output gain Register name: CONDITION1 Flag name: GS
Flag name Output gain GS L H 0dB 6dB Default
(4) Disable mode select Register name: CONDITION2 Flag name: PD This flag enables/disables the analog block. When the analog block is disabled, the output pins are high impedance.
Flag name Mode PD L H Enable (normal operation) Disable (no operation) Default
(5) Input multiplexer selection Register name: CONDITION2 Flag name: MUX This flag selects the A or B input for all three channels (IN1x, IN2x, IN3x). Note that this flag is significant only when the MUXSEL input is LOW. See "Input Multiplexer Switching (MUXSEL)".
Flag name MUX L H *1. n = 1, 2, 3 INnA INnB Input selection*1 Default
(6) fc mode switching (1/2 cutoff frequency switching) Register name: CONDITION2 Flag name: HALF This flag switches the cutoff frequency of CH-2 and CH-3 to divide the value set by the FCSET register into halves. Note that the CH-1 cutoff frequency cannot be switched. This mode is suitable for systems where the sampling frequency varies due to Y, Cr, and Cb requirements, such as digital component signals or digital HDTV signals.
Flag name fc mode HALF L H Standard fc mode (CH-1, CH-2, CH-3 cutoff frequency is identical) Half fc mode (CH-2, CH-3 cutoff frequency is 1/2 that of CH-1) Default
NIPPON PRECISION CIRCUITS INC.--15
SM5302A (7) Filter bypass mode Register name: CONDITION2 Flag name: BYPASS This flag allows the lowpass filter to be bypassed. The output gain can be switched, even in filter bypass mode. The input type, multiplexer function, and output gain can all be set just as in filter mode. However, the cutoff frequency and fc mode settings have no effect on the outputs.
Flag name BYPASS L H Filter Filter mode (signals pass through lowpass filter) Filter bypass mode (signals bypass lowpass filter) Default
(8) Maximum number of slave addresses Register name: CONDITION2 Flag name: NCA The NCA flag sets the maximum number of slave addresses to either 2 or 3. The NCA setting modifies the ADS input pin equivalent circuit as shown below. When NCA = LOW (max = 2), switches SW31 to SW33 are OFF, reducing the current consumed in comparison to when NCA = HIGH (max = 3). Note that only 2 ADS input levels (LOW or HIGH) are valid. When NCA = HIGH (max = 3), switches SW31 to SW33 are ON and hence current is consumed regardless of whether the ADS input is LOW, HIGH, or Open. However, note that 3 ADS input levels are valid. Note. The default value for NCA is HIGH (max = 3). If NCA is once set to LOW (max = 2) for a device addressed by the setting when ADS is Open, that device is subsequently no longer accessible.
Flag name NCA L Maximum number of slave address 2 (2-address mode) 3 (3-address mode) Default ADS level LOW HIGH Open LOW HIGH Open Slave address 1001000 1001001 Invalid 1001000 1001001 1001010 ADS pin current flow No
H
Yes
NCA=2
SW21
I 2C Control
NCA=L(2) Address decoder NCA=H(3)
SW31 SW32 SW33
NCA=3
ADS
NIPPON PRECISION CIRCUITS INC.--16
SM5302A
Lowpass Filter
The IC has built-in 5th-order lowpass filters with variable cutoff frequency. The frequency range is determined by the resistor (RISET) connected between ISET and GND, and the cutoff frequency is set by register FCDATA data. The cutoff frequency vs. FCDATA values are listed in table 2, and shown graphically in figure 1.
Table 2. Cutoff frequency vs. FCDATA (RISET = 1.8k)
FCDATA 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 FCSET (hex) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F Cutoff freq. [MHz] 4.74 4.95 5.15 5.36 5.56 5.77 5.97 6.18 6.38 6.59 6.79 6.99 7.20 7.40 7.60 7.80 8.00 8.20 8.40 8.60 8.80 9.00 9.20 9.40 9.60 9.79 9.99 10.19 10.38 10.58 10.77 10.97 11.16 11.36 11.55 11.75 11.94 12.13 12.32 12.52 12.71 12.90 13.09 13.28 13.47 13.66 13.85 14.04 14.23 14.41 14.60 14.79 14.98 15.16 15.35 15.54 15.72 15.91 16.09 16.27 16.46 16.64 16.82 17.01 FCDATA 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 FCSET (hex) 40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D 6E 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F Cutoff freq. [MHz] 17.19 17.37 17.55 17.73 17.91 18.09 18.27 18.45 18.63 18.81 18.99 19.17 19.35 19.52 19.70 19.88 20.05 20.23 20.40 20.58 20.75 20.93 21.10 21.27 21.45 21.62 21.79 21.96 22.13 22.30 22.47 22.65 22.81 22.98 23.15 23.32 23.49 23.66 23.83 23.99 24.16 24.33 24.49 24.66 24.82 24.99 25.15 25.31 25.48 25.64 25.80 25.97 26.13 26.29 26.45 26.61 26.77 26.93 27.09 27.25 27.41 27.57 27.73 27.88 FCDATA 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 FCSET (hex) 80 81 82 83 84 85 86 87 88 89 8A 8B 8C 8D 8E 8F 90 91 92 93 94 95 96 97 98 99 9A 9B 9C 9D 9E 9F A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF Cutoff freq. [MHz] 7.80 8.13 8.47 8.80 9.13 9.45 9.78 10.11 10.44 10.76 11.09 11.41 11.74 12.06 12.38 12.70 13.02 13.34 13.66 13.98 14.30 14.61 14.93 15.25 15.56 15.87 16.19 16.50 16.81 17.12 17.43 17.74 18.04 18.35 18.66 18.96 19.27 19.57 19.88 20.18 20.48 20.78 21.08 21.38 21.68 21.98 22.27 22.57 22.87 23.16 23.45 23.75 24.04 24.33 24.62 24.91 25.20 25.49 25.78 26.06 26.35 26.63 26.92 27.20 FCDATA 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 FCSET (hex) C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF E0 E1 E2 E3 E4 E5 E6 E7 E8 E9 EA EB EC ED EE EF F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 FA FB FC FD FE FF Cutoff freq. [MHz] 27.49 27.77 28.05 28.33 28.61 28.89 29.17 29.44 29.72 30.00 30.27 30.55 30.82 31.09 31.36 31.63 31.90 32.17 32.44 32.71 32.98 33.24 33.51 33.77 34.04 34.30 34.56 34.83 35.09 35.35 35.61 35.87 36.12 36.38 36.64 36.89 37.15 37.40 37.65 37.91 38.16 38.41 38.66 38.91 39.16 39.40 39.65 39.90 40.14 40.39 40.63 40.87 41.11 41.36 41.60 41.84 42.07 42.31 42.55 42.79 43.02 43.26 43.49 43.73
NIPPON PRECISION CIRCUITS INC.--17
SM5302A
50 45 40 35 30 25 20 15 10 5 0 0 32 64 96 128 160 192 224 256 FCDATA
Figure 1. Cutoff frequency vs. FCDATA (RISET = 1.8k)
RISET
RISET controls the internal current source, and its connection is essential. The recommended value is 1.8k. In disable mode and filter bypass mode, the ISET pin is high impedance, and no current flows into RISET. Note. A value other than 1.8k will change the current consumption, so caution should be taken to ensure the power dissipation does not exceed the absolute maximum rating for the package.
Half fc Mode
In half fc mode, the CH-2 and CH-3 cutoff frequency is 1/2 that of the CH-1 cutoff frequency setting. Half fc mode is useful for systems where the sampling frequency varies due to luminance (Y) and color difference signal (Cr, Cb) requirements as in digital component signals. Note in figure 2 that the cutoff frequency ratio for a given cutoff frequency setting (FCDATA) is not constant.
Group Delay Characteristics
The group delay varies with the cutoff frequency setting, as shown in figure 3. Note also that in half fc mode, the group delay between CH-1 and CH-2/CH-3 varies.
60% 58% HALF = High RISET = 1.8k 56% 54% 52% 50% 48% 46% 44% 42% 40% 0 32 64
fc [MHz]
100 90 80 70 60 50 40 30 20 10 0
FCDATA = 10
Group delay [ns]
Ratio *
FCDATA = 227
96 128 160 192 224 256 FCDATA
0
10
20 30 40 50 Frequency [MHz]
60
Figure 2. Cutoff frequency ratio (half fc mode)
* Ratio of CH-2 and CH-3 cutoff frequency at half fc mode based on CH-1 cutoff frequency.
Figure 3. Group delay characteristics
NIPPON PRECISION CIRCUITS INC.--18
SM5302A
Filter Bypass Mode
In filter bypass mode, the lowpass filter is bypassed and the signal is input to the output buffer stage. The input type, multiplexer function, and output gain are set just as for filter mode. The cutoff frequency setting and fc mode setting have no effect on the outputs. In this mode, the passband frequency is 80MHz (typ), which can support SXGA-class signals.
Input Multiplexer Switching (MUXSEL)
The input multiplexer setting can also be set using the MUXSEL input. When set using the I2C BUS, a certain amount of communication time is required, but the setting can be made using the MUXSEL input with arbitrary timing for high-speed switching.
MUXSEL pin L L H H *1. n = 1, 2, 3 MUX flag L H L H Multiplexer selection*1 INnA INnB INnB INnB
Power-ON Reset
When power is applied, an internal power-ON reset circuit operates initializing the internal register flags to their default settings. At power-ON, all supplies should be applied simultaneously.
Sag Compensation Circuit
A sag compensation circuit is built-in between the OUTnA and OUTnB pins. In circuits where the load resistance is small and the capacitance required is large, using the sag compensation circuit allows the total capacitance and mounting area to be reduced. If the sag compensation circuit is not used, output OUTnA should be connected to OUTnB. The electrical characteristics are not guaranteed if OUTnB is left open circuit.
OUTnA
OUTnA
OUTnB
OUTnB
Figure 4. Connection without sag compensation circuit
Figure 5. Connection with sag compensation circuit
Reference Voltage (REF)
The REFn pins (n = 1, 2, 3) are internal reference voltage outputs. A 10 F capacitor connected to ground is recommended for stability. REF1, REF2, and REF3 are independent reference voltage outputs, and have no correspondence with channels CH-1, CH-2, and CH-3. In disable mode, they are high impedance outputs.
NIPPON PRECISION CIRCUITS INC.--19
SM5302A
USAGE PRECAUTIONS
Slave Address (94h) Setting
When slave address 94h is used, the ADS input must be left open circuit. In this case, an external resistor should be connected as shown in figure 6 to reduce the risk of malfunction due to large external spikes or other noise. The recommended value is 10k.
Oscillation Prevention Capacitor Connection
If the sag compensation circuit is used with 2 output capacitors connected, the capacitors should be mounted within approximately 8cm of the IC pins. If the distance exceeds 8cm, they may cause an oscillation. A 15pF oscillation prevention capacitor should be connected between OUTnA and OUTnB. If the sag compensation circuit is not used, OUTnA is connected to OUTnB. As there is only 1 output capacitor, an oscillation prevention capacitor is not required.
Unused Analog Inputs
It is recommended that unused analog inputs should be connected to ground through a capacitor as shown in figure 8.
Direct Input Mode
In direct input mode, the signal is connected to the input without an input capacitor. However, the input DC voltage range varies with the mode setting, hence the signal must be appropriately biased for the corresponding mode. The recommended LOW-level voltage (VL) and HIGH-level voltage (VH) for each mode is shown in table 3 (see figure 9, VCC = 5V). If the input voltage exceeds these limits, harmonic distortion may occur in the output signal. Note that even if these limits are exceeded, device breakdown will not occur if still within the absolute maximum ratings.
VDD
10k
> 8cm OUTnA
ADS
10k
15p
OUTnB
VSS
Slave address = 94h
Figure 6. Slave address 94h setting
Figure 7. Oscillation prevention capacitor connection
VCC INnA (Used input)
Video Signal In
VH
Video Signal In
INnA INnB
INnB (Unused input)
VL
GND
Figure 8. Unused analog inputs
Figure 9. Direct input mode
NIPPON PRECISION CIRCUITS INC.--20
SM5302A
Table 3. Direct mode recommended input DC voltage range (VCC = 5V)
Mode setting Gain fc mode Filter/Bypass mode Sag compensation circuit*1 Used CH-2, CH-3 h0 Standard CH-1 Not used CH-2, CH-3 Filter CH-1 Used CH-2, CH-3 i0 0dB Half CH-1 Not used CH-2, CH-3 CH-1 Used j0 - CH-2, CH-3 Bypass CH-1 Not used CH-2, CH-3 CH-1 Used CH-2, CH-3 h6 Standard CH-1 Not used CH-2, CH-3 Filter CH-1 Used CH-2, CH-3 i6 6dB Half CH-1 Not used CH-2, CH-3 CH-1 Used j6 - CH-2, CH-3 Bypass CH-1 Not used CH-2, CH-3 *1. Refer to figure 4 or 5 in "Sag Compensation Circuit". 1.4 2.9 1.4 2.9 1.7 3.0 1.6 3.1 1.8 2.95 1.7 3.0 1.6 3.1 1.7 3.0 1.1 3.6 1.0 3.3 1.5 3.7 1.3 3.7 1.6 3.6 1.5 3.5 1.3 3.7 Channel VL [V] VH [V]
CH-1 1.5 3.5
NIPPON PRECISION CIRCUITS INC.--21
SM5302A
TYPICAL CHARACTERISTICS
VCC = 5.0V, VDD = 5.0V, Ta = 25C, VIN = 1.0Vp-p, RISET = 1.8k, RL = 75, unless otherwise noted.
12 Gain 6 0 Phase -6 -12 -18 -24 -30 -36 -42 -48 0.1 1 10 Frequency [MHz]
270 180 90 0 -90 -180 -270 -360 -450 -540 -630 100
12 6 0 -6 -12 -18 -24 -30 -36 -42 -48 0
Gain
Group delay 20 40 60 80 Frequency [MHz]
200 180 160 140 120 100 80 60 40 20 0 100
Figure 10. Gain and Phase characteristics (6dB, filter bypass mode)
Figure 11. Gain and Group delay characteristics (6dB, filter bypass mode)
12 Gain 6 0 Phase -6 -12 -18 -24 -30 -36 -42 -48 0.1 1 10 Frequency [MHz]
270 180 90 0 -90 -180 -270 -360 -450 -540 -630 100
12 6 0 -6 -12 -18 -24 -30 -36 -42 -48 0
Gain
Group delay
200 180 160 140 120 100 80 60 40 20 0 40
10 20 30 Frequency [MHz]
Figure 12. Gain and Phase characteristics (6dB, standard fc mode, FCDATA = 10)
Figure 13. Gain and Group delay characteristics (6dB, standard fc mode, FCDATA = 10)
12 Gain 6 0 Phase -6 -12 -18 -24 -30 -36 -42 -48 0.1 1 10 Frequency [MHz]
270 180 90 0 -90 -180 -270 -360 -450 -540 -630 100
12 6 0 -6 -12 -18 -24 -30 -36 -42 -48 0
Phase [deg]
Gain Group delay
200 180 160 140 120 100 80 60 40 20 0 40
10 20 30 Frequency [MHz]
Figure 14. Gain and Phase Characteristics (6dB, half fc mode, FCDATA = 10)
Figure 15. Gain and Group delay characteristics (6dB, half fc mode, FCDATA = 10)
NIPPON PRECISION CIRCUITS INC.--22
Group delay [ns]
Gain [dB]
Gain [dB]
Group delay [ns]
Phase [deg]
Gain [dB]
Gain [dB]
Group delay [ns]
Phase [deg]
Gain [dB]
Gain [dB]
SM5302A
12 Gain 6 0 Phase -6 -12 -18 -24 -30 -36 -42 -48 0.1 1 10 Frequency [MHz]
270 180 90 0 -90 -180 -270 -360 -450 -540 -630 100
12 Gain 6 0 -6 -12 -18 -24 -30 -36 Group delay -42 -48 0 20 40 60 80 Frequency [MHz]
200 180 160 140 120 100 80 60 40 20 0 100
Figure 16. Gain and Phase characteristics (6dB, standard fc mode, FCDATA = 227)
Figure 17. Gain and Group delay characteristics (6dB, standard fc mode, FCDATA = 227)
12 Gain 6 0 Phase -6 -12 -18 -24 -30 -36 -42 -48 0.1 1 10 Frequency [MHz]
270 180 90 0 -90 -180 -270 -360 -450 -540 -630 100
12 Gain 6 0 -6 -12 -18 -24 -30 Group delay -36 -42 -48 0 20 40 60 80 Frequency [MHz]
200 180 160 140 120 100 80 60 40 20 0 100
Figure 18. Gain and Phase characteristics (6dB, half fc mode, FCDATA = 227)
Figure 19. Gain and Group delay characteristics (6dB, half fc mode, FCDATA = 227)
NIPPON PRECISION CIRCUITS INC.--23
Group delay [ns]
Phase [deg]
Gain [dB]
Gain [dB]
Group delay [ns]
Phase [deg]
Gain [dB]
Gain [dB]
SM5302A
(Bypass mode) 12 6 0 -6 -12 -18 -24 -30 -36 -42 -48 0.1
(Bypass mode) 0 -90
Phase [deg]
Gain [dB]
-180 -270 -360 -450 -540 -630 (4) (3) (2) (1)
(1) (2) (3) (4)
1 10 Frequency [MHz]
100
0.1
1 10 Frequency [MHz]
100
Figure 20. Gain vs. FCDATA, fc mode (6dB)
Figure 21. Phase vs. FCDATA, fc mode (6dB)
FCDATA (1) (2) (3) (4) 227 227 10 10
fc mode standard half standard half (1) (2) (3) (4)
FCDATA 227 227 10 10
fc mode standard half standard half
180 160
Group delay [ns]
140 120 100 80 60 40 20 0 0 10
(4) (3) (2) (1) (Bypass mode)
20 30 40 50 Frequency [MHz]
60
Figure 22. Group delay vs. FCDATA, fc mode (6dB)
FCDATA (1) (2) (3) (4) 227 227 10 10 fc mode standard half standard half
NIPPON PRECISION CIRCUITS INC.--24
SM5302A
160 150 140 ICC1*1 130 120 110 100 ICC2*2 90 80 70 60 4.25 4.5 4.75 5 5.25 5.5 5.75 VCC [V]
160 150 140 130 ICC1*1 120 110 100 ICC2*2 90 80 70 60 -50 -25 0
ICC [mA]
ICC [mA]
25 50 Ta [C]
75 100
Figure 23. ICC1 vs. VCC (6dB, FCDATA = 255)
*1. filter mode, FCDATA = 255 *2. filter bypass mode
Figure 24. ICC1 vs. Ta (6dB, FCDATA = 255)
*1. filter mode, FCDATA = 255 *2. filter bypass mode
160 150
7
6.5 Gain [dB] 0 64 128 FCDATA 192 256 Gain [dB] 0 25 Ta [C] 50 75 100 0 25 50 Ta [C] 75 100 ICC1 [mA] 140 130 120 5.5 110 100 5 4.25 4.5 4.75 5 5.25 5.5 5.75 VCC [V]
6
Figure 25. ICC1 vs. FCDATA (6dB)
7
Figure 26. Gain vs. VCC (6dB)
1
6.5 Gain [dB]
0.5
6
0
5.5 5 -50 -25
-0.5
-1 4.25 4.5 4.75 5 5.25 5.5 5.75 VCC [V]
Figure 27. Gain vs. Ta (6dB)
1
Figure 28. Gain vs. VCC (0dB)
0.5 Gain [dB]
0
-0.5
-1 -50 -25
Figure 29. Gain vs. Ta (0dB)
NIPPON PRECISION CIRCUITS INC.--25
SM5302A
Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter "Products") are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from NIPPON PRECISION CIRCUITS INC. (hereinafter "NPC"). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, Fukuzumi 2-chome, Koto-ku, Tokyo 135-8430, Japan Telephone: +81-3-3642-6661 Facsimile: +81-3-3642-6698 http://www.npc.co.jp/ Email: sales@npc.co.jp
NC0301AE 2004.04
NIPPON PRECISION CIRCUITS INC.--26

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