AD7908 Analog Devices, AD7908 Datasheet - Page 3

• Manufacturer Part Number: AD7908
• Description: 8-Channel, 1 MSPS, 8-Bit ADC with Sequencer in 20-Lead TSSOP
• Manufacturer: Analog Devices

Specifications of AD7908

• Resolution (bits): 8bit
• # Chan: 8
• Sample Rate: 1MSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni (Vref) x 2
• Adc Architecture: SAR
• Pkg Type: SOP

SPECIFICATIONS
AD7908 SPECIFICATIONS
AV
Table 1.
Parameter
DYNAMIC PERFORMANCE
DC ACCURACY
ANALOG INPUT
REFERENCE INPUT
LOGIC INPUTS
Signal-to-Noise Ratio (SNR)
Total Harmonic Distortion (THD)
Peak Harmonic or Spurious Noise (SFDR)
Intermodulation Distortion (IMD)
Aperture Delay
Aperture Jitter
Channel-to-Channel Isolation
Full Power Bandwidth
Resolution
Integral Nonlinearity
Differential Nonlinearity
0 V to REF
0 V to 2 × REF
Input Voltage Ranges
DC Leakage Current
Input Capacitance
REF
DC Leakage Current
REF
Input High Voltage, V
Input Low Voltage, V
Input Current, I
Input Capacitance, C
Signal-to-(Noise + Distortion) (SINAD)
DD
Second-Order Terms
Third-Order Terms
Offset Error
Offset Error Match
Gain Error
Gain Error Match
Positive Gain Error
Positive Gain Error Match
Zero Code Error
Zero Code Error Match
Negative Gain Error
Negative Gain Error Match
= V
IN
IN
Input Voltage
Input Impedance
DRIVE
IN
Input Range
2
= 2.7 V to 5.25 V, REF
IN
IN
Input Range
INL
IN
INH
3
2
2
2
2
IN
= 2.5 V, f
2
2
±0.2
±0.5
±0.05
±0.5
±0.1
±0.2
±0.05
B Version
49
48.5
49
48.5
−66
−64
−90
−90
10
50
−85
8.2
1.6
8
±0.2
±0.2
±0.05
±0.2
±0.05
0 to REF
0 to 2 × REF
±1
20
2.5
±1
36
0.7 × V
0.3 × V
±1
10
SCLK
= 20 MHz, T
DRIVE
DRIVE
IN
1
IN
Rev. D | Page 3 of 32
A
= T
MIN
ns typ
LSB max
LSB max
LSB max
LSB max
Unit
dB min
dB min
dB min
dB min
dB max
dB max
dB typ
dB typ
ps typ
dB typ
MHz typ
MHz typ
Bits
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
V
V
μA max
pF typ
V
μA max
kΩ typ
V min
V max
μA max
pF max
to T
MAX
, unless otherwise noted.
Test Conditions/Comments
f
B models
W models
B models
W models
fa = 40.1 kHz, fb = 41.5 kHz
f
@ 3 dB
@ 0.1 dB
Guaranteed no missed codes to 8 bits
Straight binary output coding
−REF
RANGE bit set to 1
RANGE bit set to 0, AV
±1% specified performance
f
Typically 10 nA, V
IN
IN
SAMPLE
twos complement output coding
5.25 V
= 50 kHz sine wave, f
= 400 kHz
IN
AD7908/AD7918/AD7928
= 1 MSPS
to +REF
IN
biased about REF
IN
= 0 V or V
DD
SCLK
/V
DRIVE
= 20 MHz
DRIVE
= 4.75 V to
IN
with