Datasheet

Data Sheet AD7877
Rev. D | Page 3 of 44
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 Min Typ Max Unit Test Conditions/Comments
DC ACCURACY
Resolution 12 Bits
No Missing Codes 11 12 Bits
Integral Nonlinearity (INL)
1
±2 LSB LSB size = 610 µV
Differential Nonlinearity (DNL)
1
Minimum LSB size = 610 µV
Negative DNL −0.99 LSB
Positive DNL +2 LSB
Offset Error
1
±5 LSB Specified for 11bits
Gain Error
1
±3 LSB Specified for 11 bits; external reference
Noise 70 µV rms
Power Supply Rejection 70 dB
Internal Clock Frequency 2 MHz
SWITCH DRIVERS
On Resistance
1
Y+, X+ 14 Ω
Y−, X− 14 Ω
ANALOG INPUTS
Input Voltage Ranges 0 V
REF
V
DC Leakage Current ±0.1 µA
Input Capacitance 30 pF
Accuracy 0.3 % All channels, internal V
REF
REFERENCE INPUT/OUTPUT
Internal Reference Voltage 2.44 2.55 V
Internal Reference Tempco ±50 ppm/°C
V
REF
Input Voltage Range 1 V
CC
V
DC Leakage Current ±1 µA
V
REF
Input Impedance
1
GΩ
CS = GND or V
CC
; typically 25 Ω when the on-board
reference is enabled
TEMPERATURE MEASUREMENT
Temperature Range −40 +85 °C
Resolution
Differential Method
2
1.6 °C
Single Conversion Method
3
0.3 °C
Accuracy
Differential Method
2
±4
°C
0°C to 70°C
Single Conversion Method
3
±2 °C Calibrated at 25°C
BATTERY MONITOR
Input Voltage Range
0.5
5
V
@ V
REF
= 2.5 V
Input Impedance 14 kΩ Sampling, 1 GΩ when the battery monitor is off
Accuracy 1 3.2 % External/internal reference, see Figure 26