SPI Programmable-Gain Amplifier
with Input VOS Trim and Output Op Amp
CS
SCLK
tCSS
tCSO
tCL
tCH
tCSW
tCP
tCS1
tCSH
tDS
tDH
DIN
Figure 1. SPI Interface Timing Diagram
Typical Operating Characteristics
(VCC = 5V, VGND = 0V, VIN+ = VIN- = 0V, Gain = 10V/V, ROUTA = ROUTB = 1kΩ to VCC/2, TA = +25°C, unless otherwise noted.)
PGA GAIN vs. FREQUENCY
60
40
20
0
-20
-40
-60
RL = 10kΩ to VCC/2
-80
0.01
0.1
1
10
100
FREQUENCY (MHz)
AMPLIFIER B GAIN vs. FREQUENCY
3
RL = 10kΩ to VCC/2
2
1
0
-1
-2
-3
-4
0.01
0.1
1
10
FREQUENCY (MHz)
PGA GAIN vs. FREQUENCY
3
1V/V ≤ GAIN ≤ 157V/V
2 RL = 10kΩ to VCC/2
1
GAIN =30V/V
0
-1
-2
GAIN = 160V/V
-3
-4
0.01
0.1
1
10
FREQUENCY (MHz)
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
0
1V/V ≤ GAIN ≤ 157V/V
-10
-20
-30
-40
-50
-60
-70
-80
0.001 0.01 0.1
1
10 100
FREQUENCY (MHz)
AMPLIFIER B GAIN vs. FREQUENCY
60
RL = 10kΩ to VCC/2
40
20
0
-20
-40
-60
-80
0.01
0.1
1
10
100
FREQUENCY (MHz)
GAIN ERROR vs. TEMPERATURE
0.20
0.15
0.10
0.05
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
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