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RF2670
10
Typical Applications
* Digital Cordless Telephones * Secure Communication Links * Wireless LANs * Inventory Tracking * Wireless Security * Battery Powered Applications
8MHZ DUAL BASEBAND AGC WITH PROGRAMMABLE LOW PASS FILTERING
Product Description
The RF2670 is a monolithic integrated circuit specifically designed for direct conversion to baseband QPSK receivers. The part provides dual baseband amplifiers with a 70dB gain range (single pin analog input) and separate I and Q RSSI. On-chip programmable baseband filters are incorporated into each amplifier providing 1MHz, 2MHz, 4MHz, or 8MHz bandwidth with a 5-pole Bessel response. I and Q output are available in digital or analog form. The data comparators use a self generated DC reference to track DC offsets in the received signal. The analog outputs have a 500mVpp swing with approximately 1.7V DC offset. A 2.0V reference voltage is also available for A/D converters changing DC bias.
1
.157 .150
.033
.010 .004
.344 .337
.012 .008 .025
.244 .228 8MAX 0MIN
.069 .053
.050 .016
.010 .008
Optimum Technology Matching(R) Applied
Package Style: SSOP-24
10
IF AMPLIERS
u
Si BJT Si Bi-CMOS
GaAs HBT SiGe HBT
GaAs MESFET Si CMOS
Features
* I/Q Baseband Receivers * 10dB to 80dB Gain Range
VCC1
20 IN Q+ IN Q23 24
0-25 dB 0-20 dB -12-+12 17dB
VCC2
* Digital and Analog Outputs
15 Q DATA 18 IF OUT Q 21 DCFB Q
5
VCC3 8
* On-Chip Selectable IF Bandwidths * Reference Voltage for A/D Converter * 2.7V to 3.6V Operation
6 dB
PD BW SEL2 BW SEL1
11 14 13 DC Bias
10 RSSI I 17 VREF 16 RSSI Q 19 VGC
IN I+ IN I-
2 1
9 I DATA 7 IF OUT I
4 DCFB I
Ordering Information
RF2670 RF2670PCBA 8MHz Dual Baseband AGC with Programmable Low Pass Filtering Fully Assembled Eval Board. Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Functional Block Diagram
RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA
Rev A4 010820
10-45
RF2670
Absolute Maximum Ratings Parameter
Supply Voltage Control Voltages Input RF Level Operating Ambient Temperature Storage Temperature
Ratings
-0.5 to +3.6 -0.5 to +3.6 +20 -40 to +85 -40 to +150
Unit
VDC VDC dBm C C Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s).
Parameter
Baseband Amplifiers
Frequency Range
Specification Min. Typ. Max.
0.01 8
Unit
MHz
Condition
T=25C, VCC =3.0V Minimum frequency is dependent upon input blocking cap, DC feedback cap, and gain setting. Recommended components yields a minimum frequency of less than 10kHz. At maximum gain setting At minimum gain setting At maximum gain setting At minimum gain setting
Voltage Gain Noise Figure Input IP3 Output DC offset Gain Control Range Gain Control Voltage Range Gain Control Sensitivity VGA Output Voltage VGA DC Output Voltage Output P1dB RSSI Range RSSI Output Voltage Compliance Input Impedance
77
65 1.2
80 5 35 -65 +2 0 70 -0.08 500
83
25 2.0
dB dB dB dBm dBm mV dB V dB/mV mVPP V VPP dB V
10
IF AMPLIERS
1 55
1.7 1.64 60 0.5 to 2.4 2 Five pole Bessel 1, 2, 4, 8 1 100 2.5
1.5
k
Driving a 5k load At maximum gain setting Maximum RSSI is 2.5V or VCC -0.3, whichever is less. Differential Five pole Bessel internal LPF. Three pole external LPF. Selectable from 1MHz, 2MHz, 4MHz, and 8MHz. At 8MHz, increasing as bandwidth decreases.
Integrated Filters
Characteristics Bandwidth Passband Ripple Group Delay Ultimate Rejection 50 80 100 8 2 VCC -0.3V 0.3 40 VCC -0.3V 0.3 >1 10 13 5 MHz dB ns dB dB MHz ns V V mV V V M ms Voltage supplied to the input Voltage supplied to the input With recommended DC feedback cap (270nF)
Data Amplifiers
Voltage Gain Bandwidth Rise and Fall Time Logic High Output Logic Low Output Hysteresis
5pF Load Can sink/source 1mA and maintain these logic levels. Can sink/source 1mA and maintain these logic levels.
Power Down Control
Logical Controls "ON" Logical Controls "OFF" Control Input Impedance Turn on Time
10-46
Rev A4 010820
RF2670
Parameter
Power Supply
Voltage Current Consumption 2.7 3.0 13 3.6 17 1 V mA A VCC =3.0V; PD=High VCC =3.0V; Sleep Mode, PD=Low
Specification Min. Typ. Max.
Unit
Condition
10
IF AMPLIERS
Rev A4 010820
10-47
RF2670
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 Function IN IIN I+ GND2 DCFB I VCC2 GND3 IF OUT I VCC3 I DATA RSSI I PD GND1 BW SEL1 Description
Complementary input for the in-phase IF channel. Input for the in-phase IF channel. Ground for VCC2. DC feedback capacitor for in-phase channel. Power supply for VGA amplifier 3, differential to single-ended converter, and post filter. Ground for VCC3. Analog signal IF output for in-phase channel. Power supply for data amplifier. Logic-level data output for the in-phase channel. This is a digital output signal obtained from the output of a Schmitt trigger. Received signal strength indicator for the in-phase channel. Enable pin for the receiver circuits. PD >2.0V powers up all of the functions. PD<1.0V turns off all of the functions. Ground for VCC1 for both the in-phase and quadrature channels. Bandwidth select logic input. Pin 13 and pin 14 provide a two bit control word for the setting of the IF bandwidth. See Table1. Additional filtering should be used at the amplifiers to precisely control the 3dB bandwidth of the system. See design information details about differential input filters. See pin 13. Logic-level data output for the quadrature channel. This is a digital output signal obtained from the output of a Schmitt trigger. Received signal strength indicator for the quadrature channel. Gain control reference voltage. Analog signal IF output for quadrature channel. Gain control voltage. Power supply for bias circuits and VGA amplifiers for both the in-phase and quadrature channels. DC feedback capacitor for quadrature channel. Ground for VCC1 for both the in-phase and quadrature channels. Plus input for quadrature channel Minus input for quadrature channel
Interface Schematic
14 15 16 17 18 19 20 21 22 23 24
BW SEL2 Q DATA RSSI Q VREF IF OUT Q VGC VCC1 DCFB Q GND1 IN Q+ IN Q-
10
IF AMPLIERS
Table 1: Bandwidth Selection Controls
BWSEL1 0 0 1 1
BWSEL2 0 1 0 1
IF-3dB Frequency 1MHz 2MHz 4MHz 8MHz
10-48
Rev A4 010820
RF2670
Differential Filter Design Information
Butterworth Response
RS
L
RL
C1 RS L
C2 RL
12 12 1 1 C1bw -- 10 C2bw -- 10 6 2 2 Lbw RL 10 C1 = ------------------------------------- ;C2 = ------------------------------------- ;L = ----------------------------------2 fc RL 2 fc RL 2 fc
C1bw = 5.1672 ;C2bw = 15.4554 ;Lbw = 0.1377 RS RS = 125 ;RL = 1000 ;------ = 0.125 RL
Differential LC Filter Component Values (Butterworth Response)
100000
10
IF AMPLIERS
C2 (pF) C1 (pF) L (H)
10000
Component Value
1000
100
10
1 1.E+05
1.E+06 Frequency
1.E+07
Rev A4 010820
10-49
RF2670
Differential Filter Design Information (Cont.)
Bessel Response
RS
L
RL
C1 RS L
C2 RL
12 12 1 1 C1bw -- 10 C2bw -- 10 6 2 2 Lbw RL 10 C1 = ------------------------------------- ;C2 = ------------------------------------- ;L = ----------------------------------2 fc RL 2 fc RL 2 fc
C1bw = 2.9825 ;C2bw = 15.4697 ;Lbw = 0.0860 RS RS = 125 ;RL = 1000 ;------ = 0.125 RL
10
100000
Differential LC Filter Component Values (Bessel Response)
IF AMPLIERS
10000
Component Value
1000
100
C2 (pF)
C1 (pF) 10
1 1.E+05
L (H) 1.E+06 Frequency 1.E+07
10-50
Rev A4 010820
RF2670
Pin Out
IN-I 1 IN+I 2 GND2 3 DCFBI 4 VCC2 5 GND3 6 IF OUT I 7 VCC3 8 I DATA 9 RSSI I 10 PD 11 GND1 12
24 IN-Q 23 IN+Q 22 GND1 21 DCFBQ 20 VCC1 19 VGC 18 IF OUT Q 17 V REF 16 RSSI Q 15 Q DATA 14 BW SEL2 13 BWSEL1
10
IF AMPLIERS
Rev A4 010820
10-51
RF2670
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
50 strip T1 C1 220 pF L2 10 H DCFB I C9 220 nF VCC J2 IF OUT I 50 strip 7 IF OUT I 8 VCC3 J3 I DATA RSSI I C13 68 pF V IF EN 50 strip 9 I DATA 10 RSSI I 11 V IF EN 12 GND1 RSSI Q 16 Q DATA 15 BW SEL2 14 BW SEL1 13 50 strip IF OUT Q 18 VREF 17 C11 47 nF C12 68 pF RSSI Q J6 Q DATA BW SEL2 BW SEL1
2670400-
J1 I IN
L1 10 H
C5 100 nF C2 1 nF C6 100 nF 1 IN I2 IN I+ 3 GND2 4 DCFB I 5 VCC2 6 GND3 IN Q- 24 IN Q+ 23 GND1 22 DCFB Q 21 VCC1 20 VGC 19
C7 100 nF C3 1 nF C8 100 nF
L3 10 H T2 C4 220 pF L4 10 H
50 strip
J4 Q IN
DCFB Q C10 220 nF VCC VGC J5 IF OUT Q VREF
50 strip
P1 P1-1 1 2 P1-3 3 V IF EN GND DCFB I P2-3 P2-1
P2 1 2 3 RSSI Q GND RSSI I
10
IF AMPLIERS
L1-L4 and C1-C4 make two LPFs. The fc of the RF2670 is variable; therefore the L and C components must be variable. The following table gives recommended component values ("std" indicates standard eval board value). Desired BW BW1, BW2 C1, C4 (pF) C2, C3 (pF) L1-L4 (H) 700 kHz 1.4 MHz 2.8 MHz 7.0 MHz 00 01 10 11 330 220 (std) 100 33 1800 1000 (std) 470 180 22
P4 P4-1 1 2 DCFB Q GND VREF P5-3 P5-1
P5 1 2 3 BW SEL2 GND BW SEL1
10 4.7 P4-3 2.2 P3 3
P3-1 C21 100 pF C22 10 nF C23 100 pF C24 10 nF C25 100 pF C26 10 nF C27 10 F P3-3
1 2 3
VCC GND VGC
10-52
Rev A4 010820
RF2670
Evaluation Board Layout Board Size 3.0" x 2.0"
10
IF AMPLIERS
Rev A4 010820
10-53
RF2670
RF2670 IF Bandwidth Response
65.0 55.0 45.0 35.0 25.0 15.0 5.0 -5.0 -15.0 -25.0 -35.0 0.1 1.0 10.0 100.0
Gain (dB)
BW_SEL (0-0) BW_SEL (0-1) BW_SEL (1-0) BW_SEL (1-1)
IF Frequency (MHz)
10
IF AMPLIERS
10-54
Rev A4 010820
RF2670
IIP3 versus Voltage Gain
10.0 -40C 0.0 -10.0 -20.0 +25C +100C 30.0 35.0 40.0 -40C +25C +100C
Noise Figure versus Voltage Gain (Non-Matched Input Z)
Noise Figure (dB)
25.0
IP3 (dB)
-30.0 -40.0 -50.0 -60.0 -70.0 -80.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0
20.0
15.0
10.0
5.0
0.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0
Voltage Gain (dB)
Voltage Gain (dB)
Voltage Gain versus Gain Control Voltage
90.0 -40C 80.0 70.0 60.0 50.0 40.0 30.0 20.0 10.0 0.0 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 +25C +100C
Voltage Gain (dB)
10
IF AMPLIERS
Gain Control Voltage (V)
Rev A4 010820
10-55
RF2670
10
IF AMPLIERS
10-56
Rev A4 010820

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