Datasheet

Parameter A Version
1
B Version
1
Units Test Conditions/Comments
DYNAMIC PERFORMANCE
Signal to Noise + Distortion Ratio
3
70 71 dB min Typically SNR is 72 dB
(SNR) V
IN
= 10 kHz Sine Wave, f
SAMPLE
= 200 kHz
(for L Version: f
SAMPLE
= 100 kHz @ f
CLKIN
= 2 MHz)
Total Harmonic Distortion (THD) –78 –78 dB max V
IN
= 10 kHz Sine Wave, f
SAMPLE
= 200 kHz
(for L Version: f
SAMPLE
= 100 kHz @ f
CLKIN
= 2 MHz)
Peak Harmonic or Spurious Noise –78 –78 dB max V
IN
= 10 kHz Sine Wave, f
SAMPLE
= 200 kHz
(for L Version: f
SAMPLE
= 100 kHz @ f
CLKIN
= 2 MHz)
Intermodulation Distortion (IMD)
Second Order Terms –78 –78 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f
SAMPLE
= 200 kHz
(for L Version: f
SAMPLE
= 100 kHz @ f
CLKIN
= 2 MHz)
Third Order Terms –78 –78 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f
SAMPLE
= 200 kHz
(for L Version: f
SAMPLE
= 100 kHz @ f
CLKIN
= 2 MHz)
Channel-to-Channel Isolation –80 –80 dB typ V
IN
= 25 kHz
DC ACCURACY
Resolution 12 12 Bits
Integral Nonlinearity ±1 ±0.5 LSB max 5 V Reference V
DD
= 5 V
Differential Nonlinearity ±1 ±1 LSB max Guaranteed No Missed Codes to 12 Bits
Unipolar Offset Error ±5 ±5 LSB max
±2 ±2 LSB typ
Unipolar Offset Error Match 2(3) 2 LSB max
Positive Full-Scale Error ±5 ±5 LSB max
±2 ±2 LSB typ
Negative Full-Scale Error ±2 ±2 LSB max
Full-Scale Error Match 1 1 LSB max
Bipolar Zero Error ±1 ±1 LSB typ
Bipolar Zero Error Match 2 2 LSB typ
ANALOG INPUT
Input Voltage Ranges 0 to V
REF
0 to V
REF
Volts i.e., AIN(+) – AIN(–) = 0 to V
REF
, AIN(–) Can Be
Biased Up But AIN(+) Cannot Go Below AIN(–)
±V
REF
/2 ±V
REF
/2 Volts i.e., AIN(+) – AIN(–) = –V
REF
/2 to +V
REF
/2, AIN(–)
Should Be Biased to +V
REF
/2 and AIN(+) Can Go
Below AIN(–) But Cannot Go Below 0 V
Leakage Current ±1 ±1 µA max
Input Capacitance 20 20 pF typ
REFERENCE INPUT/OUTPUT
REF
IN
Input Voltage Range 2.3/V
DD
2.3/V
DD
V min/max Functional from 1.2 V
Input Impedance 150 150 kΩ typ
REF
OUT
Output Voltage 2.3/2.7 2.3/2.7 V min/max
REF
OUT
Tempco 20 20 ppm/°C typ
LOGIC INPUTS
Input High Voltage, V
INH
2.4 2.4 V min AV
DD
= DV
DD
= 4.5 V to 5.5 V
2.1 2.1 V min AV
DD
= DV
DD
= 3.0 V to 3.6 V
CAL Pin 3 3 V min AV
DD
= DV
DD
= 4.5 V to 5.5 V
2.4 2.4 V min AV
DD
= DV
DD
= 3.0 V to 3.6 V
Input Low Voltage, V
INL
0.8 0.8 V max AV
DD
= DV
DD
= 4.5 V to 5.5 V
0.6 0.6 V max AV
DD
= DV
DD
= 3.0 V to 3.6 V
Input Current, I
IN
±10 ±10 µA max Typically 10 nA, V
IN
= 0 V or V
DD
Input Capacitance, C
IN
4
10 10 pF max
LOGIC OUTPUTS
Output High Voltage, V
OH
4 4 V min AV
DD
= DV
DD
= 4.5 V to 5.5 V
2.4 2.4 V min AV
DD
= DV
DD
= 3.0 V to 3.6 V
Output Low Voltage, V
OL
0.4 0.4 V max I
SINK
= 1.6 mA
Floating State Leakage Current ±10 ±10 µA max
Floating-State Output Capacitance
4
10 10 pF max
Output Coding Straight (Natural) Binary Unipolar Input Range
2s Complement Bipolar Input Range
AD7859/AD7859L–SPECIFICATIONS
1, 2
(AV
DD
= DV
DD
= +3.0 V to +5.5 V, REF
IN
/REF
OUT
= 2.5 V
External Reference, f
CLKIN
= 4 MHz (for L Version: 1.8 MHz (08C to +708C) and 1 MHz (–408C to +858C)); f
SAMPLE
= 200 kHz (AD7859) 100 kHz
(AD7859L); SLEEP = Logic High; T
A
= T
MIN
to T
MAX
, unless otherwise noted.) Specifications in () apply to the AD7859L.
–2–
REV. A