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SM6800A Class-D Mono Amplifier for Mobile Telephones
OVERVIEW
The SM6800A is an analog-input, class-D mono amplifier. Class-D operation provides high efficiency and low power consumption. The device also incorporates a selectable real-time operation dynamic range compression function that effectively suppresses the distortion in the saturation level region output by soft-clipping, boosting the average sound pressure from the speaker during playback. It also incorporates an input equalizer pin for output speaker frequency characteristics adjustment. These features make the device ideal for use in mobile telephones and speaker applications requiring miniaturization and high-efficiency. The output stage has a BTL output configuration where the output waveform inverts only the modulation components, enabling direct drive connection, without using an LC filter, to a dynamic speaker. The device is available in miniature 20-pin QFN packages, and requires only a peripheral chip capacitor to form a miniature amplifier circuit.
FEATURES
I I I I I
PINOUT
(Top view)
PROT TEST TM2 TM1 VSS3
20 19 18 17 16
I I
APPLICATIONS
I I I
Cellular phone PDA Digital still camera
PACKAGE DIMENSIONS
(Unit: mm)
4.20 0.20 4.00 0.10
ORDERING INFORMATION
Device SM6800AB Package
4.20 0.20
20-pin QFN
4.00 0.10
20
1 0.50
VREF3 VREF2 VREF1 PDWN MUTEN
Operating supply voltage: 2.7 to 4.3V Low current consumption: 4.8mA (VDD = 3.6V) Output power: 0.7W (VDD = 3.6V, 8 load) Output fundamental frequency: 125kHz Gain * 4.5dB (Normal) * 12dB to 4.5dB automatic adjustment in response to the input level (Dynamic range compression mode) Silicon-gate CMOS process Package: 20-pin QFN
VDD1 IN EQP EQN VSS1
1 2 3 4 5 6 7 8 9 10
15 14 13 12 11
VDD3 OUTP VSS2 OUTN VDD2
0.60 0.10
0.05 0.22 0.05 0.05 M
1.00MAX
NIPPON PRECISION CIRCUITS INC.--1
+ 0.03 0.02 - 0.02
0.22
SM6800A
BLOCK DIAGRAM
EQP
EQN VDD1 VSS1
TM1
TM2 TEST
VSS3 VDD2
IN
- +
VSS2
LEVEL SHIFTER PWM Modulator
- + BUFFER
OUTP
VREF1 VREF2
LEVEL SHIFTER
BUFFER
OUTN
VREF1 VREF2
BIAS, VREF1, VREF2, VREF3
VREF3
MUTE, POWERDOWN, PROTECTION
VDD3
OSC
VREF1 VREF2 VREF3
MUTEN PDWN
PIN DESCRIPTION
Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name1 VDD1 IN EQP EQN VSS1 VREF3 VREF2 VREF1 PDWN MUTEN VDD2 OUTN VSS2 OUTP VDD3 VSS3 TM1 TM2 TEST PROT I/O2 - I I I - - - - I I - O - O - - I I Ip O Supply (input system) Signal input Equalizer network connection Equalizer network connection Ground (input system) Reference voltage 3 (internal bias voltage monitor. No connection for normal operation) Reference voltage 2 (internal bias voltage monitor. No connection for normal operation) Reference voltage 1 (bias voltage) Power-down control (active LOW) Mute control (active LOW) Supply (OUTN stage) Speaker minus (-) output Ground (OUTP and OUTN stages) Speaker plus (+) output Supply (OUTP stage) Ground (output system) Dynamic range compression mode setting 1 Dynamic range compression mode setting 2 Test pin (HIGH: normal operation, LOW: test mode) Protection circuit output (HIGH: protection circuit operation, LOW: normal operation) Function
1. VDDS = VDD1, VDDP = VDD2 = VDD3, VSS = VSS1 = VSS2 = VSS3 2. Ip = input pin with built-in pull-up resistor
NIPPON PRECISION CIRCUITS INC.--2
SM6800A
SPECIFICATIONS
Absolute Maximum Ratings
Parameter Supply voltage range Supply voltage ground Input voltage range Storage temperature range Output current Power dissipation1 Symbol VDDS, VDDP VSS VIN TSTG IO PD Rating -0.3 to 4.6 0 VSS - 0.3 to VDDS + 0.3 -55 to +125 300 340 Unit V V V C mA mW
1. Under NPC measurement conditions, Ja = 116.2C/W. The power dissipation is given by: PD = ((TJMAX - Ta)/ Ja) where TJMAX = 125C and Ta = 85C
Recommended Operating Conditions
VSS = VSS1 = VSS2 = VSS3 = 0V, VDDS =VDD1, VDDP = VDD2 = VDD3 unless otherwise noted
Parameter Supply voltage 1 Supply voltage 2 Supply voltage difference Operating temperature range Symbol VDDS VDDP VDD3 - VDD2 Ta Rating 2.7 to 4.3 2.7 to 4.3 Unit V V V C
0.1
-40 to 85
Electrical Characteristics
DC Characteristics VSS1 = VSS2 = VSS3 = 0V, VDD1 = 2.7 to 4.3V, VDD2 = VDD3 = 2.7 to 4.3V, Ta = -40 to 85C unless otherwise noted
Rating Parameter Pin Symbol IDD1A IDD1S VDD2 + VDD3 Input voltage 1 Input voltage 2 Input leakage current 1 Input leakage current 2 TEST TM1, TM2, MUTEN, PDWN TEST TM1, TM2, MUTEN, PDWN IDDAA IDDAS VIH1 VIH2 VIL2 ILH1 ILH2 ILL2 (Note 1) (Note 2) (Note 1) (Note 2) HIGH level HIGH level LOW level VIN = VDD1 VIN = VDD1 VIN = 0V Conditions min - - - - 0.8VDDS 0.9VDDS - - - - VDD1 Current consumption typ 4.6 0.2 0.2 0.1 - - - - - - max 8.0 0.5 0.6 0.3 - - 0.4 1.0 1.0 1.0 mA A mA A V V V A A A Unit
Note 1: MUTEN = HIGH, PDWN = HIGH, input and VREF1 connected by 600, TM1 = TM2 = LOW, no-load output Note 2: MUTEN = LOW, PDWN = LOW, input and VREF1 connected by 600, TM1 = TM2 = LOW, no-load output
NIPPON PRECISION CIRCUITS INC.--3
SM6800A AC Analog Characteristics VDD1 = VDD2 = VDD3 = 3.6V, VSS1 = VSS2 = VSS3 = 0V, 0.708Vrms analog input amplitude, 1kHz input signal frequency, Ta = 25C, "Measurement block diagram", "Measurement conditions", "Measurement circuit", TM1 = TM2 = LOW, PDWN = MUTEN = HIGH, unless otherwise noted
Analog input characteristics (IN)
Rating Parameter Reference input amplitude 1 Reference input amplitude 2 Input resistance Input clipping voltage Symbol VAI1 VAI2 RIN VCLP PO PO PO Conditions min typ 0.708 0.178 60 1 max - - 72 1.3 Vrms Vrms k Vrms Unit - - 48
= 0.2W = 0.05W = 0.5W
0.7
Analog output characteristics (OUTP, OUTN)
Rating Parameter Symbol Conditions min Voltage gain 1 Voltage gain 2 Residual noise voltage Total harmonic distortion + noise Maximum output power Mute-mode output voltage HIGH-level output voltage LOW-level output voltage Efficiency A1 A2 VNS THD + N POMAX VMUTE VOH VOL EEF Maximum output power conditions TM1 = TM2 = LOW, reference input amplitude 1 TM1 = HIGH, TM2 = LOW, reference input amplitude 2 TM1 = TM2 = LOW, input and VREF1 connected by 600 PO = 0.2W, reference input amplitude 1 Output power when THD = 10% Output power when MUTEN = LOW 2.5 10.0 - - 0.6 - 90.0 VDDP - 0.1 0 80 typ 4.5 12.0 68 0.4 0.7 - 110 VDDP - 0.02 0.02 83 max 6.5 14.0 90 1.0 0.8 - VDDP 0.1 - dB dB Vrms % W dBV V V % Unit
Reference voltage characteristics (VREF1)
Rating Parameter Reference output voltage 1 Symbol min VREF1 0.45VDDS typ 0.5VDDS max 0.55VDDS V Unit
NIPPON PRECISION CIRCUITS INC.--4
SM6800A
Measurement block diagram
40H SPOUT POS 1F BALANCED INPUT +
EVALUATION BOARD
40H SPOUT NEG 1F
8
AUDIO ANALYZER
BALANCED INPUT -
Measurement conditions
Parameter Audio Analyzer (Audio Precision System Two Cascade) Built-in Filters Low-pass filter (20kHz) ON High-pass filter (22Hz) ON Low-pass filter (20kHz) ON High-pass filter (22Hz) ON A-weighted
Excluding residual noise
Residual noise voltage
NIPPON PRECISION CIRCUITS INC.--5
SM6800A
Measurement circuit
TEST PROT (H NORMAL) SW3 H L SW4
TM2 SW5 H L
TM1
H L
PROT
TEST
VDD1 IN
SIGNAL INPUT
C1 1 VDD1 IN C3 150p EQP C4 1 EQN VSS1
POWER VDD (2.7 to 4.3V)
VSS3
TM2
TM1
SIGNAL VDD (2.7 to 4.3V)
VDD3 OUTP
POWER VDD R7* C8
0 (JUMPER)
1
EQP
SPOUT POS POWER VSS (0V)
VSS2 R8* OUTN
POWER VDD (2.7 to 4.3V) 0 (JUMPER)
EQN
SIGNAL VSS (0V)
SPOUT NEG C9 1
C5 1 SW1* H L
MUTEN
VREF3
VREF2
VREF1
VSS1
PDWN
VDD2
SW2* H L
ANALOG VSS (0V)
Note. *C2, C6, C7: not inserted *R1, R2, R3: not inserted *R7, R8: series resistors for dielectric speaker *SW1: HIGH = Power on, LOW = Power off *SW2: LOW = Mute on, HIGH = Mute off D-Range CP MODE TM1 OFF 1 2 3 L H L H TM2 L L H H
NIPPON PRECISION CIRCUITS INC.--6
SM6800A
FUNCTIONAL DESCRIPTION
Power-down (PDWN)
The device enters power-down mode when PDWN goes LOW. When powered-down, the outputs become high impedance and the internal oscillation stops. In power-down mode, the MUTEN pin should be held LOW.
Mute (MUTEN)
Mute operation occurs when MUTEN goes LOW. In mute mode, the outputs become high impedance. During mute operation, the protection circuit operation is disabled, but the outputs are protected against output short circuits by their high impedance state. When power is applied, MUTEN should be held LOW for a short interval, shown in the timing diagram below, to prevent pop noise from the speaker. Also, applying and releasing mute operation after power is applied can occur at high speed without generating pop noise.
min. 40msec
PDWN MUTEN
Note. VREF1 load capacitance = 1F
Protection Circuit
The protection circuit operates if there is an output short-circuit to the supply, short-circuit to ground, or other excessive load abnormal condition lasting longer than approximately 1s. Normal operation resumes after approximately 5 seconds. When the protection circuit becomes active, the PROT output goes HIGH and the outputs become high impedance.
NIPPON PRECISION CIRCUITS INC.--7
SM6800A
Input Equalizer (IN, EQP, EQN)
An input equalizer network can be connected to pins IN, EQP, and EQN, as shown in the input equivalent circuit and equalizer circuit below.
R01 R02 C02
R04 R03 C03 C04
EQP 3
EQN 4 60k
C01 IN'
60k 2 IN VREF1
- +
The frequency response of the equalizer circuit is given by the following equation, where is the frequency.
1 1 + 60000 Response = 20 x log10 1 + 2C01 1 R03 + 1 2C03 + 1 + 2C04 R04 [dB] 1 1 1 + + 60000 R01 1 R02 + 1 2C02
Dynamic Range Compression Mode (TM1, TM2)
The dynamic range compression mode is selected by the state of the TM1 and TM2 inputs. When a compression mode is used, the gain for small input signals is increased while large input signals are converted using a curve that performs soft-clipping. This increases the average sound pressure level emitted from the speaker during playback.
Dynamic range compression mode OFF 1 2 3 TM1 L H L H TM2 L L H H Effect No effect Small effect Medium effect Large effect
NIPPON PRECISION CIRCUITS INC.--8
SM6800A
TYPICAL APPLICATION CIRCUITS
Dynamic Speaker
LC-type LPF connection
47F OUTPUT 2 SPOUT POS 14 1F
SOUND GENERATOR IC
SM6800
47F SPOUT NEG 12 1F
Direct connection
OUTPUT
2
SPOUT POS 14
SOUND GENERATOR IC
SM6800
SPOUT NEG 12
Dielectric Speaker
A dielectric speaker is capacitive in nature, and therefore requires output resistor connection.
OUTPUT
2
4 SPOUT POS 14 *
SOUND GENERATOR IC
SM6800
4 SPOUT NEG 12
* Dielectric speaker Taiyo Yuden MLS20070, MLS23070, MLS25070 or similar
NIPPON PRECISION CIRCUITS INC.--9
SM6800A
TYPICAL CHARACTERISTICS
Measurement conditions: Refer to "Analog output characteristics". Measurement circuit: Refer to "Measurement circuit".
100 50 20 10 5
10 5 2 1 500m
Output power [W]
THD + N [%]
2 1 0.5 0.2 0.1 0.05 0.02 0.01 -25
THD + N
Output power
200m 100m 50m 20m 10m 5m 2m 1m
-22.5
-20
-17.5
-15
-12.5
-10
-7.5
-5
-2.5
+0
+2.5
+5
Input [dBV]
Input vs. THD + N and Output power (VDD = 3.6V)
+10 +7.5 +5 +2.5
D-RANGE-CP3 D-RANGE-CP2
Output [dBV]
+0 -2.5 -5 -7.5 -10 -12.5 -15 -17.5 -20 -20 -18 -16 -14 -12 -10 -8 -6 -4 -2 -0 +2 +4
Normal mode D-RANGE-CP1
Input [dBV]
Input vs. Output (VDD = 3.6V)
NIPPON PRECISION CIRCUITS INC.--10
SM6800A
-70 -75 -80 -85
Residual noise [dBV]
-90 -95 -100 -105 -110 -115 -120 -125 -130 -135 -140 20 50 100 200 500 1k 2k 5k 10k 20k
Frequency [Hz]
Residual noise vs. Frequency (VDD = 3.6V)
10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 20 50 100 200 500 1k 2k
THD + N
+6 +5 +4 +3 +2 +1 -0 -1 -2 -3 -4 -5 -6
Output voltage [dBr]
THD + N [%]
Output voltage
5k
10k
20k
Frequency [Hz]
THD + N and Output voltage vs. Frequency (VDD = 3.6V)
NIPPON PRECISION CIRCUITS INC.--11
SM6800A
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
NC0316AE 2004.09
NIPPON PRECISION CIRCUITS INC.--12

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