Datasheet

AD8557
Rev. C | Page 10 of 24
140
0
–50 175
TEMPERATURE (°C)
CMRR (dB)
120
100
80
60
40
20
–25 0 25 50 75 100 125 150
CMRR GAIN +28
CMRR GAIN +1300
CMRR GAIN +448
06013-022
Figure 22. CMRR vs. Temperature at Different Gains, V
SY
= 2.7 V
START .0 Hz STOP 1 000 000.0Hz
RBW 100Hz VBW 300Hz ST 900s
REF 502µV M
ARKER 20 000.0Hz
5dB/DIV RANGE 12.5mV 1.89µV/√Hz
06013-023
Figure 23. Input Voltage Noise Density vs. Frequency (0 Hz to 1000 kHz)
CH1 10.0mV M 1.00s A CH1 –2.80mV
1
CHANNEL 1
15.2mV p-p
06013-024
VOLTAGE NOISE, GAIN = 28 × 1000
Figure 24. Low Frequency Input Voltage Noise, 0.1 Hz to 10 Hz, V
SY
= 5 V
CH1 10.0mV M 1.00s A CH1 –2.80mV
1
CHANNEL 1
16.6mV p-p
06013-025
VOLTAGE NOISE, GAIN = 28 × 1000
Figure 25. Low Frequency Input Voltage Noise 0.1 Hz to 10 Hz, V
SY
= 2.7 V
70
–20
0.1 10k
FREQUENCY (kHz)
GAIN (dB)
1 10 100 1k
60
50
40
30
20
10
0
–10
HIGH GAIN +1300 62.28dB
LOW GAIN +28 28.9dB
V
SY
= 5V
06013-026
Figure 26. Closed-Loop Gain vs. Frequency Measured at Output Pin, V
SY
= 5 V
70
–20
0.1 10k
FREQUENCY (kHz)
GAIN (dB)
1 10 100 1k
60
50
40
30
20
10
0
–10
HIGH GAIN +1300 62.28dB
LOW GAIN +28 28.9dB
V
SY
= 2.7V
06013-027
Figure 27. Closed-Loop Gain vs. Frequency Measured at Output Pin, V
SY
= 2.7 V