Data Sheet
AD7873
SPECIFICATIONS
VCC = 2.7 V to 3.6 V, VREF = 2.5 V internal or external, fDCLK = 2 MHz; TA = −40°C to +85°C, unless otherwise noted.
Table 1.
Parameter
AD7873A1
AD7873B1
Unit
Test Conditions/Comments
DC ACCURACY
Resolution
12
11
±2
12
12
± 1
–0.9/+1.5
±±
±ꢀ
70
70
Bits
No Missing Codes
Integral Nonlinearity2
Differential Nonlinearity2
Offset Error2
Gain Error2
Noise
Power Supply Rejection
SWITCH DRIVERS
On Resistance2
Bits min
LSB max
LSB max
LSB max
LSB max
µV rms typ
dB typ
±±
±ꢀ
70
70
+VCC = 2.7 V
External reference
Y+, X+
Y–, X–
5
±
5
±
Ω typ
Ω typ
ANALOG INPUT
Input Voltage Ranges
DC Leakage Current
Input Capacitance
REFERENCE INPUT/OUTPUT
Internal Reference Voltage
Internal Reference Tempco
VREF Input Voltage Range
DC Leakage Current
VREF Input Impedance
0 to VREF
±0.1
37
0 to VREF
±0.1
37
V
µA typ
pF typ
2.ꢀ5/2.55
±15
1/VCC
±1
2.ꢀ5/2.55
±15
1/VCC
± 1
V min/max
ppm/°C typ
V min/max
µA max
1
1
GΩ typ
CS = GND or +VCC; typically 2±0 Ω when the
on-board reference is enabled
TEMPERATURE MEASUREMENT
Temperature Range
Resolution
–ꢀ0/+85
–ꢀ0/+85
°C min/max
Differential Method3
Single Conversion Methodꢀ
Accuracy
1.±
0.3
1.±
0.3
°C typ
°C typ
Differential Method3
Single Conversion Methodꢀ
BATTERY MONITOR
Input Voltage Range
Input Impedance
±2
±2
±2
±2
°C typ
°C typ
0/±
10
±2.5
±3
0/±
10
±2
±3
V min/max
kΩ typ
% max
Sampling; 1 GΩ when battery monitor is off
External reference
Internal reference
Accuracy
% max
LOGIC INPUTS
Input High Voltage, VINH
Input Low Voltage, VINL
Input Current, IIN
2.ꢀ
0.ꢀ
±1
10
2.ꢀ
0.ꢀ
±1
10
V min
V max
µA max
pF max
Typically 10 nA, VIN = 0 V or +VCC
5
Input Capacitance, CIN
Rev. F | Page 3 of 28
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