AD7858/AD7858L–SPECIFICATIONS1, 2 (AVDD = DVDD = +3.0 V to +5.5 V, REFIN/REFOUT = 2.5 V External
Reference unless otherwise noted, fCLKIN = 4 MHz (1.8 MHz B Grade (0؇C to +70؇C), 1 MHz A and B Grades (–40؇C to +85؇C) for L Version); fSAMPLE
200 kHz (AD7858), 100 kHz (AD7858L); SLEEP = Logic High; TA = TMIN to TMAX, unless otherwise noted.) Specifications in ( ) apply to the AD7858L.
=
P
arameter
A Version1 B Version1
Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
Signal to Noise + Distortion Ratio3 70
(SNR)
71
dB min
Typically SNR is 72 dB
VIN = 10 kHz Sine Wave, fSAMPLE = 200 kHz (100 kHz)
Total Harmonic Distortion (THD) –78
–78
–78
dB max
dB max
VIN = 10 kHz Sine Wave, fSAMPLE = 200 kHz (100 kHz)
VIN = 10 kHz Sine Wave, fSAMPLE = 200 kHz (100 kHz)
Peak Harmonic or Spurious Noise
Intermodulation Distortion (IMD)
Second Order Terms
–78
–78
–78
–90
–80
–80
–90
dB typ
dB typ
dB typ
fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 200 kHz (100 kHz)
fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 200 kHz (100 kHz)
VIN = 25 kHz
Third Order Terms
Channel-to-Channel Isolation
DC ACCURACY
Resolution
Integral Nonlinearity
Any Channel
12
1
1
12
1
0.5
Bits
LSB max
LSB max
LSB max
LSB max
LSB max
2.5 V External Reference VDD = 3 V, VDD = 5 V (B Grade Only)
5 V External Reference VDD = 5 V
(L Version, 5 V External Reference, VDD = 5 V)
(L Version)
Guaranteed No Missed Codes to 12 Bits. 2.5 V External
Reference VDD = 3 V, 5 V External Reference, VDD = 5 V
( 1)
( 1)
1
Differential Nonlinearity
1
Total Unadjusted Error
Unipolar Offset Error
1
5
1
5
LSB typ
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
Typically 2 LSBs
5 V External Reference, VDD = 5 V
(L Version)
2.5
( 3)
( 1.5)
1.5
4
2.5
( 3)
( 1.5)
1.5
4
(L Version, 5 V External Reference, VDD = 5 V)
Unipolar Offset Error Match
Positive Full-Scale Error
1.5
1
1.5
1
5 V External Reference, VDD = 5 V
Positive Full-Scale Error Match
ANALOG INPUT
Input Voltage Ranges
0 to VREF
0 to VREF
Volts
i.e., AIN(+) – AIN(–) = 0 to VREF, AIN(–) can be biased
up but AIN(+) cannot go below AIN(–)
Leakage Current
Input Capacitance
1
20
1
20
µA max
pF typ
REFERENCE INPUT/OUTPUT
REFIN Input Voltage Range
Input Impedance
2.3/VDD
150
2.3/VDD
150
V min/max
kΩ typ
Functional from 1.2 V
REFOUT Output Voltage
REFOUT Tempco
2.3/2.7
20
2.3/2.7
20
V min/max
ppm/°C typ
LOGIC INPUTS
Input High Voltage, VINH
2.4
2.1
0.8
0.6
10
2.4
2.1
0.8
0.6
10
V min
V min
V max
V max
µA max
pF max
AVDD = DVDD = 4.5 V to 5.5 V
AVDD = DVDD = 3.0 V to 3.6 V
AVDD = DVDD = 4.5 V to 5.5 V
AVDD = DVDD = 3.0 V to 3.6 V
Typically 10 nA, VIN = 0 V or VDD
Input Low Voltage, VINL
Input Current, IIN
Input Capacitance, CIN
4
10
10
LOGIC OUTPUTS
Output High Voltage, VOH
ISOURCE = 200 µA
4
4
2.4
0.4
10
10
V min
V min
V max
µA max
pF max
AVDD = DVDD = 4.5 V to 5.5 V
AVDD = DVDD = 3.0 V to 3.6 V
ISINK = 0.8 mA
2.4
0.4
10
Output Low Voltage, VOL
Floating-State Leakage Current
Floating-State Output Capacitance4 10
Output Coding
Straight (Natural) Binary
CONVERSION RATE
Conversion Time
4.6 (18)
0.4 (1)
4.6
(10)
0.4 (1)
µs max
µs max
µs min
(L Versions Only, –40°C to +85°C, 1 MHz CLKIN)
(L Versions Only, 0°C to +70°C, 1.8 MHz CLKIN)
(L Versions Only)
Track/Hold Acquisition Time
–2–
REV. B
ADI [ ADI ]
