Datasheet

P arameter 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 (100 kHz)
Total Harmonic Distortion (THD) –78 –78 dB max V
IN
= 10 kHz Sine Wave, f
SAMPLE
= 200 kHz (100 kHz)
Peak Harmonic or Spurious Noise –78 –78 dB max V
IN
= 10 kHz Sine Wave, f
SAMPLE
= 200 kHz (100 kHz)
Intermodulation Distortion (IMD)
Second Order Terms –78 –80 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f
SAMPLE
= 200 kHz (100 kHz)
Third Order Terms –78 –80 dB typ fa = 9.983 kHz, fb = 10.05 kHz, f
SAMPLE
= 200 kHz (100 kHz)
Channel-to-Channel Isolation –90 –90 dB typ V
IN
= 25 kHz
DC ACCURACY Any Channel
Resolution 12 12 Bits
Integral Nonlinearity ±1 ±1 LSB max 2.5 V External Reference V
DD
= 3 V, V
DD
= 5 V (B Grade Only)
±1 ±0.5 LSB max 5 V External Reference V
DD
= 5 V
(±1) LSB max (L Version, 5 V External Reference, V
DD
= 5 V)
(±1) LSB max (L Version)
Differential Nonlinearity ±1 ±1 LSB max Guaranteed No Missed Codes to 12 Bits. 2.5 V External
Reference V
DD
= 3 V, 5 V External Reference, V
DD
= 5 V
Total Unadjusted Error ±1 ±1 LSB typ
Unipolar Offset Error ±5 ±5 LSB max Typically ±2 LSBs
±2.5 ±2.5 LSB max 5 V External Reference, V
DD
= 5 V
(± 3) (±3) LSB max (L Version)
(± 1.5) (±1.5) LSB max (L Version, 5 V External Reference, V
DD
= 5 V)
Unipolar Offset Error Match 1.5 1.5 LSB max
Positive Full-Scale Error ± 4 ±4 LSB max
±1.5 ±1.5 LSB max 5 V External Reference, V
DD
= 5 V
Positive Full-Scale Error Match 1 1 LSB max
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(–)
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
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
I
SOURCE
= 200 µA
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
= 0.8 mA
Floating-State Leakage Current ± 10 ± 10 µA max
Floating-State Output Capacitance
4
10 10 pF max
Output Coding Straight (Natural) Binary
CONVERSION RATE
Conversion Time 4.6 (18) 4.6 µs max (L Versions Only, –40°C to +85°C, 1 MHz CLKIN)
(10) µs max (L Versions Only, 0°C to +70°C, 1.8 MHz CLKIN)
Track/Hold Acquisition Time 0.4 (1) 0.4 (1) µs min (L Versions Only)
REV. B
–2–
AD7858/AD7858L–SPECIFICATIONS
1, 2
(AV
DD
= DV
DD
= +3.0 V to +5.5 V, REF
IN
/REF
OUT
= 2.5 V External
Reference unless otherwise noted, f
CLKIN
= 4 MHz (1.8 MHz B Grade (0ⴗC to +70ⴗC), 1 MHz A and B Grades (–40ⴗC to +85ⴗC) for L Version); f
SAMPLE
=
200 kHz (AD7858), 100 kHz (AD7858L); SLEEP = Logic High; T
A
= T
MIN
to T
MAX
, unless otherwise noted.) Specifications in ( ) apply to the AD7858L.