AD7858 Datasheet, PDF (2/32 Pages) Analog Devices – 3 V to 5 V Single Supply, 200 kSPS 8-Channel, 12-Bit Sampling ADC

AD7858/AD7858L–SPECIFICATIONS1, 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 (0؇C to +70؇C), 1 MHz A and B Grades (–40؇C to +85؇C) 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.
Parameter
A Version¹ B Version¹
Units
Test Conditions/Comments
DYNAMIC PERFORMANCE
Signal to Noise + Distortion Ratio³ 70
(SNR)
Total Harmonic Distortion (THD) –78
Peak Harmonic or Spurious Noise –78
Intermodulation Distortion (IMD)
Second Order Terms
–78
Third Order Terms
–78
Channel-to-Channel Isolation
–90
DC ACCURACY
Resolution
12
Integral Nonlinearity
±1
±1
(± 1)
Differential Nonlinearity
±1
Total Unadjusted Error
Unipolar Offset Error
Unipolar Offset Error Match
Positive Full-Scale Error
Positive Full-Scale Error Match
±1
±5
± 2.5
(± 3)
(± 1.5)
1.5
±4
± 1.5
1
71
–78
–78
–80
–80
–90
12
±1
± 0.5
(± 1)
±1
±1
±5
± 2.5
(± 3)
(± 1.5)
1.5
±4
± 1.5
1
dB min
dB max
dB max
dB typ
dB typ
dB typ
Bits
LSB max
LSB max
LSB max
LSB max
LSB max
LSB typ
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
Typically SNR is 72 dB
V_IN = 10 kHz Sine Wave, f_SAMPLE = 200 kHz (100 kHz)
V_IN = 10 kHz Sine Wave, f_SAMPLE = 200 kHz (100 kHz)
V_IN = 10 kHz Sine Wave, f_SAMPLE = 200 kHz (100 kHz)
fa = 9.983 kHz, fb = 10.05 kHz, f_SAMPLE = 200 kHz (100 kHz)
fa = 9.983 kHz, fb = 10.05 kHz, f_SAMPLE = 200 kHz (100 kHz)
V_IN = 25 kHz
Any Channel
2.5 V External Reference V_DD = 3 V, V_DD = 5 V (B Grade Only)
5 V External Reference V_DD = 5 V
(L Version, 5 V External Reference, V_DD = 5 V)
(L Version)
Guaranteed No Missed Codes to 12 Bits. 2.5 V External
Reference V_DD = 3 V, 5 V External Reference, V_DD = 5 V
Typically ± 2 LSBs
5 V External Reference, V_DD = 5 V
(L Version)
(L Version, 5 V External Reference, V_DD = 5 V)
5 V External Reference, V_DD = 5 V
ANALOG INPUT
Input Voltage Ranges
Leakage Current
Input Capacitance
0 to V_REF
±1
20
0 to V_REF
±1
20
Volts
µA max
pF typ
i.e., AIN(+) – AIN(–) = 0 to V_REF, AIN(–) can be biased
up but AIN(+) cannot go below AIN(–)
REFERENCE INPUT/OUTPUT
REF_IN Input Voltage Range
Input Impedance
REF_OUT Output Voltage
REF_OUT Tempco
2.3/V_DD
150
2.3/2.7
20
2.3/V_DD
150
2.3/2.7
20
LOGIC INPUTS
Input High Voltage, V_INH
Input Low Voltage, V_INL
Input Current, I_IN
Input Capacitance, C_IN4
2.4
2.4
2.1
2.1
0.8
0.8
0.6
0.6
± 10
± 10
10
10
LOGIC OUTPUTS
Output High Voltage, V_OH
4
4
2.4
2.4
Output Low Voltage, V_OL
0.4
0.4
Floating-State Leakage Current ± 10
± 10
Floating-State Output Capacitance⁴ 10
10
Output Coding
Straight (Natural) Binary
V min/max
kΩ typ
V min/max
ppm/°C typ
Functional from 1.2 V
V min
V min
V max
V max
µA max
pF max
AV_DD = DV_DD = 4.5 V to 5.5 V
AV_DD = DV_DD = 3.0 V to 3.6 V
AV_DD = DV_DD = 4.5 V to 5.5 V
AV_DD = DV_DD = 3.0 V to 3.6 V
Typically 10 nA, V_IN = 0 V or V_DD
V min
V min
V max
µA max
pF max
I_SOURCE = 200 µA
AV_DD = DV_DD = 4.5 V to 5.5 V
AV_DD = DV_DD = 3.0 V to 3.6 V
I_SINK = 0.8 mA
CONVERSION RATE
Conversion Time
Track/Hold Acquisition 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)
–2–
REV. B