Datasheet

Data Sheet AD7873
Rev. F | Page 3 of 28
SPECIFICATIONS
V
CC
= 2.7 V to 3.6 V, V
REF
= 2.5 V internal or external, f
DCLK
= 2 MHz; T
A
= −40°C to +85°C, unless otherwise noted.
Table 1.
Parameter AD7873A
1
AD7873B
1
Unit Test Conditions/Comments
DC ACCURACY
Resolution 12 12 Bits
No Missing Codes 11 12 Bits min
Integral Nonlinearity
2
±2 ± 1 LSB max
Differential Nonlinearity
2
–0.9/+1.5 LSB max
Offset Error
2
±6 ±6 LSB max +V
CC
= 2.7 V
Gain Error
2
±4 ±4 LSB max External reference
Noise 70 70 µV rms typ
Power Supply Rejection 70 70 dB typ
SWITCH DRIVERS
On Resistance
2
Y+, X+ 5 5 Ω typ
Y–, X– 6 6 Ω typ
ANALOG INPUT
Input Voltage Ranges 0 to V
REF
0 to V
REF
V
DC Leakage Current ±0.1 ±0.1 µA typ
Input Capacitance 37 37 pF typ
REFERENCE INPUT/OUTPUT
Internal Reference Voltage 2.45/2.55 2.45/2.55 V min/max
Internal Reference Tempco ±15 ±15 ppm/°C typ
V
REF
Input Voltage Range 1/V
CC
1/V
CC
V min/max
DC Leakage Current ±1 ± 1 µA max
V
REF
Input Impedance 1 1 GΩ typ
CS = GND or +V
CC
; typically 260 Ω when the
on-board reference is enabled
TEMPERATURE MEASUREMENT
Temperature Range –40/+85 –40/+85 °C min/max
Resolution
Differential Method
3
1.6 1.6 °C typ
Single Conversion Method
4
0.3 0.3 °C typ
Accuracy
Differential Method
3
±2 ±2 °C typ
Single Conversion Method
4
±2 ±2 °C typ
BATTERY MONITOR
Input Voltage Range 0/6 0/6 V min/max
Input Impedance 10 10 kΩ typ Sampling; 1 GΩ when battery monitor is off
Accuracy ±2.5 ±2 % max External reference
±3 ±3 % max Internal reference
LOGIC INPUTS
Input High Voltage, V
INH
2.4 2.4 V min
Input Low Voltage, V
INL
0.4 0.4 V max
Input Current, I
IN
±1
±1
µA max
Typically 10 nA, V
IN
= 0 V or +V
CC
Input Capacitance, C
IN
5
10 10 pF max