AD8557
Rev. C | Page 3 of 24
SPECIFICATIONS
VDD = 5.0 V, VSS = 0.0 V, VCM = 2.5 V, VOUT = 2.5 V, gain = 28, TA = 40°C to +125°C, unless otherwise specified.
Table 1.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
INPUT STAGE
Input Offset Voltage
VOS
2
12
μV
Input Offset Voltage Drift
TCVOS
27
65
nV/°C
Input Bias Current
IB
10
18
25
nA
Input Offset Current
IOS
1
4
nA
Input Voltage Range
0.6
3.8
V
Common-Mode Rejection Ratio
CMRR
VCM = 0.9 V to 3.6 V, AV = 28
75
85
dB
VCM = 0.9 V to 3.6 V, AV = 1300
96
112
dB
Linearity
VOUT = 0.2 V to 3.4 V
20
ppm
VOUT = 0.2 V to 4.8 V
1000
ppm
Differential Gain Accuracy
Second stage gain = 10 to 70
1.6
%
Differential Gain Accuracy
Second stage gain = 100 to 250
2.5
%
Differential Gain Temperature Coefficient
Second stage gain = 10 to 250
15
40
ppm/°C
DAC
Accuracy
Offset codes = 8 to 248
0.7
0.8
%
Ratiometricity
Offset codes = 8 to 248
50
ppm
Output Offset
Offset codes = 8 to 248
5
35
mV
Temperature Coefficient
20
80
ppm FS/°C
VCLAMP
Clamp Input Bias Current
ICLAMP
1.25 V to 5.0 V
200
nA
Clamp Input Voltage Range
1.25
5.0
V
OUTPUT STAGE
Short-Circuit Current
ISC
Source
45
25
mA
ISC
Sink
40
55
mA
Output Voltage, Low
VOL
RL = 10 k to 5 V
30
mV
Output Voltage, High
VOH
RL = 10 k to 0 V
4.94
V
POWER SUPPLY
Supply Current
ISY
VPOS = VNEG = 2.5 V,
VDAC code = 128, VOUT = 2.5 V
1.8
mA
Power Supply Rejection Ratio
PSRR
VDD = 2.7 V to 5.5 V
105
125
dB
DYNAMIC PERFORMANCE
Gain Bandwidth Product
GBP
First gain stage, TA = 25°C
2
MHz
Second gain stage, TA = 25°C
8
MHz
Settling Time
ts
To 0.1%, 4 V output step
8
s
NOISE PERFORMANCE
Input Referred Noise
f = 1 kHz, TA = 25°C
32
nV/√Hz
Low Frequency Noise
en p-p
f = 0.1 Hz to 10 Hz, TA = 25°C
0.5
V p-p
Total Harmonic Distortion
THD
VIN = 16.75 mV rms, f = 1 kHz,
TA = 25°C
100
dB
DIGITAL INTERFACE
Input Current
2
A
DIGIN Pulse Width to Load 0
tw0
TA = 25°C
0.05
10
s
DIGIN Pulse Width to Load 1
tw1
TA = 25°C
50
s
Time Between Pulses at DIGIN
tws
TA = 25°C
10
s
DIGIN Low
TA = 25°C
0.2 × VDD
V
DIGIN High
TA = 25°C
0.8 × VDD
V
DIGOUT Logic 0
TA = 25°C
0.2 × VDD
V
DIGOUT Logic 1
TA = 25°C
0.8 × VDD
V