AD7908 Analog Devices, AD7908 Datasheet - Page 7

• 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

AD7928 SPECIFICATIONS
A
Table 3.
Parameter
DYNAMIC PERFORMANCE
DC ACCURACY
ANALOG INPUT
REFERENCE INPUT
LOGIC INPUTS
VDD
Signal-to-(Noise + Distortion) (SINAD)
Signal-to-Noise Ratio (SNR)
Total Harmonic Distortion (THD)
Peak Harmonic or Spurious Noise
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
REF
DC Leakage Current
REF
Input High Voltage, V
Input Low Voltage, V
Input Current, I
Input Capacitance, C
Input Voltage Ranges
DC Leakage Current
Input Capacitance
(SFDR)
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
2
IN
Input Range
= 2.7 V to 5.25 V, REF
2
IN
IN
Input Range
INL
IN
INH
3
2
2
2
2
IN
= 2.5 V, f
2
SCLK
70
69.5
69
70
69.5
−77
−73
−76
−90
10
50
−85
1.6
±1
−0.9/+1.5
±8
±0.5
±1.5
±0.5
±1.5
±0.5
±8
±0.5
±1
±0.5
0 to 2 × REF
36
0.7 × V
0.3 × V
±1
10
B Version
−78
−90
8.2
12
0 to REF
±1
20
2.5
±1
= 20 MHz, T
DRIVE
DRIVE
IN
1
Rev. D | Page 7 of 32
IN
A
= T
Unit
dB min
dB min
dB min
dB min
dB min
dB max
dB max
dB max
dB max
dB typ
dB typ
ns 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
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
MIN
to T
MAX
, unless otherwise noted.
Test Conditions/Comments
f
@ 5 V, B models
@ 5 V, W models
@ 3 V typically 70 dB
B models
W models
@ 5 V typically −84 dB
@ 3 V typically −77 dB
@ 5 V typically −86 dB
@ 3 V typically −80 dB
fa = 40.1 kHz, fb = 41.5 kHz
f
@ 3 dB
@ 0.1 dB
Guaranteed no missed codes to 12 bits
Straight binary output coding
Typically ±0.5 LSB
−REF
Typically ±0.8 LSB
RANGE bit set to 1
RANGE bit set to 0, AV
±1% specified performance
f
Typically 10 nA, V
IN
IN
SAMPLE
complement output coding
= 50 kHz sine wave, f
= 400 kHz
IN
= 1 MSPS
to +REF
IN
AD7908/AD7918/AD7928
biased about REF
IN
= 0 V or V
DD
SCLK
/V
DRIVE
= 20 MHz
DRIVE
= 4.75 V to 5.25 V
IN
with twos