Datasheet
AD8555
Rev. A | Page 3 of 28
ELECTRICAL SPECIFICATIONS
At V
DD
= 5.0 V, V
SS
= 0.0 V, V
CM
= 2.5 V, V
O
= 2.5 V, −40°C ≤ T
A
≤ +125°C, unless otherwise specified.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT STAGE
Input Offset Voltage V
OS
2 10 μV
Input Offset Voltage Drift T
C
V
OS
25 65 nV/°C
Input Bias Current I
B
T
A
= 25°C 12 16 22 nA
25 nA
Input Offset Current I
OS
T
A
= 25°C 0.2 1 nA
1.5 nA
Input Voltage Range 0.6 3.8 V
Common-Mode Rejection Ratio CMRR V
CM
= 0.9 V to 3.6 V, A
V
= 70 80 92 dB
V
CM
= 0.9 V to 3.6 V, A
V
= 1,280 96 112 dB
Linearity V
O
= 0.2 V to 3.4 V 20 ppm
V
O
= 0.2 V to 4.8 V 1000 ppm
Differential Gain Accuracy Second Stage Gain = 17.5 to 100 0.35 1.6 %
Second Stage Gain = 140 to 200 0.5 2.5 %
Differential Gain Temperature Coefficient Second Stage Gain = 17.5 to 100 15 40 ppm/°C
Second Stage Gain = 140 to 200 40 100 ppm/°C
RF 14 18 22 kΩ
RF Temperature Coefficient 700 ppm/°C
DAC
Accuracy A
V
= 70, Offset Codes = 8 to 248 0.7 0.8 %
Ratiometricity A
V
= 70, Offset Codes = 8 to 248 50 ppm
Output Offset A
V
= 70, Offset Codes = 8 to 248 5 35 mV
Temperature Coefficient 3.3 15 ppm FS/°C
VCLAMP
Input Bias Current T
A
= 25°C, VCLAMP = 5 V 200 nA
500 nA
Input Voltage Range 1.25 4.94 V
OUTPUT BUFFER STAGE
Buffer Offset 7 15 mV
Short-Circuit Current I
SC
5 10 mA
Output Voltage, Low V
OL
R
L
= 10 kΩ to 5 V 30 mV
Output Voltage, High V
OH
R
L
= 10 kΩ to 0 V 4.94 V
POWER SUPPLY
Supply Current I
SY
V
O
= 2.5 V, VPOS = VNEG = 2.5V,
VDAC Code = 128
2.0 2.5 mA
Power Supply Rejection Ratio PSRR A
V
= 70 109 125 dB
DYNAMIC PERFORMANCE
Gain Bandwidth Product GBP First Gain Stage, T
A
= 25°C 2 MHz
Second Gain Stage, T
A
= 25°C 8 MHz
Output Buffer Stage 1.5 MHz
Output Buffer Slew Rate SR A
V
= 70, R
L
= 10 kΩ, C
L
= 100 pF 1.2 V/μs
Settling Time t
s
To 0.1%, A
V
= 70, 4 V Output Step 8 μs
NOISE PERFORMANCE
Input Referred Noise T
A
= 25°C, f = 1 kHz 32 nV/√Hz
Low Frequency Noise e
n p-p
f = 0.1 Hz to 10 Hz 0.5 μV p-p
Total Harmonic Distortion THD V
IN
= 16.75 mV rms, f = 1 kHz, A
V
= 100 −100 dB