Datasheet

AD8556
Rev. A | Page 4 of 28
SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
VDD = 5.0 V, VSS = 0.0 V, V
CM
= 2.5 V, V
O
= 2.5 V, −40°C ≤ T
A
≤ +140°C, unless otherwise specified.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT STAGE
Input Offset Voltage V
OS
−40°C ≤ T
A
≤ +125°C 2 10 μV
−40°C ≤ T
A
≤ +140°C 3 12 μV
Input Offset Voltage Drift T
C
V
OS
25 65 nV/°C
Input Bias Current I
B
T
A
= 25°C 38 49 54 nA
−40°C ≤ T
A
≤ +125°C 58 nA
−40°C ≤ T
A
≤ +140°C 60 nA
Input Offset Current I
OS
T
A
= 25°C 0.2 2.5 nA
−40°C ≤ T
A
≤ +125°C 3.0 nA
−40°C ≤ T
A
≤ +140°C 4.0 nA
Input Voltage Range 2.1 2.9 V
Common-Mode Rejection Ratio CMRR V
CM
= 2.1 V to 2.9 V, A
V
= 70 80 92 dB
V
CM
= 2.1 V to 2.9 V, A
V
= 1280 94 112 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 7 20 ppm/°C
Second stage gain = 140 to 200 10 40 ppm/°C
RF 14 18 22 kΩ
RF Temperature Coefficient 600 ppm/°C
DAC
Accuracy A
V
= 70, offset codes = 8 to 248 0.2 0.6 %
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 −40°C ≤ T
A
≤ +125°C 3.3 15 ppm FS/°C
−40°C ≤ T
A
≤ +140°C 25 ppm FS/°C
VCLAMP
Input Bias Current T
A
= 25°C, VCLAMP = 5 V 200 nA
−40°C ≤ T
A
≤ +125°C, VCLAMP = 5 V 500 nA
−40°C ≤ T
A
≤ +140°C, VCLAMP = 5 V 550 nA
Input Voltage Range 1.2 4.94 V
OUTPUT BUFFER STAGE
Buffer Offset 3 7 mV
Short-Circuit Current I
SC
5 10 mA
Output Voltage, Low V
OL
R
L
= 10 kΩ to 5 V 20 mV
Output Voltage, High V
OH
R
L
= 10 kΩ to 0 V 4.94 V
POWER SUPPLY
Supply Current I
SY
−40°C ≤ T
A
≤ +125°C, V
O
= 2.5 V,
VPOS = VNEG = 2.5 V, VDAC code = 128
2.0 2.7 mA
−40°C ≤ T
A
≤ +140°C, V
O
= 2.5 V,
VPOS = VNEG = 2.5 V, VDAC Code = 128
2.78 mA
Power Supply Rejection Ratio PSRR A
V
= 70 109 125 dB
Supply Voltage Required During Programming
10°C < T
PROG
< 40°C, supply capable of
driving 250 mA
5.0 5.25 5.5 V