AD7939_15 Datasheet, PDF (3/36 Pages) Analog Devices – 8-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer

Data Sheet
AD7938/AD7939
SPECIFICATIONS
AD7938 SPECIFICATIONS
VDD = VDRIVE = 2.7 V to 5.25 V, internal/external VREF = 2.5 V, unless otherwise noted, fCLKIN= 25.5 MHz, fSAMPLE = 1.5 MSPS;
TA = TMIN to TMAX, unless otherwise noted.
Table 2.
Parameter
DYNAMIC PERFORMANCE
Signal-to-Noise and Distortion (SINAD)²
Signal-to-Noise Ratio (SNR)²
Total Harmonic Distortion (THD)²
Peak Harmonic or Spurious Noise (SFDR)²
Intermodulation Distortion (IMD)²
Second-Order Terms
Third-Order Terms
Channel-to-Channel Isolation
Aperture Delay²
Aperture Jitter²
Full Power Bandwidth²
DC ACCURACY
Resolution
Integral Nonlinearity²
Differential Nonlinearity²
Differential Mode
Single-Ended Mode
Single-Ended and Pseudo Differential Input
Offset Error²
Offset Error Match²
Gain Error²
Gain Error Match²
Fully Differential Input
Positive Gain Error²
Positive Gain Error Match²
Zero-Code Error²
Zero-Code Error Match²
Negative Gain Error²
Negative Gain Error Match²
ANALOG INPUT
Single-Ended Input Range
Pseudo Differential Input Range
VIN+
VIN−
Fully Differential Input Range
VIN+ and VIN−
VIN+ and VIN−
DC Leakage Current⁴
Input Capacitance
Value¹
69
67
71
69
−73
−69.5
−72
Unit
dB min
dB min
dB min
dB min
dB max
dB max
dB max
−6
dB typ
−90
dB typ
−85
dB typ
5
ns typ
72
ps typ
50
MHz typ
10
MHz typ
12
Bits
±1
LSB max
±1.5
LSB max
±0.95
−0.95/+1.5
±12
±3
±3
±2
LSB max
LSB max
LSB max
LSB max
LSB max
LSB max
±3
LSB max
±1.5
LSB typ
±9.5
LSB max
±1
LSB typ
±3
LSB max
±1.5
LSB typ
0 to VREF
V
0 to 2 × VREF
V
0 to VREF
0 to 2 × VREF
−0.3 to +0.7
−0.3 to +1.8
V
V
V typ
V typ
VCM ± VREF/2
VCM ± VREF
±1
45
10
V
V
µA max
pF typ
pF typ
Rev. C | Page 3 of 36
Test Conditions/Comments
fIN = 50 kHz sine wave
Differential mode
Single-ended mode
Differential mode
Single-ended mode
−85 dB typ, differential mode
−80 dB typ, single-ended mode
−82 dB typ
fa = 30 kHz, fb = 50 kHz
fIN = 50 kHz, fNOISE = 300 kHz
@ 3 dB
@ 0.1 dB
Differential mode
Single-ended mode
Guaranteed no missed codes to 12 bits
Guaranteed no missed codes to 12 bits
Straight binary output coding
Twos complement output coding
RANGE bit = 0
RANGE bit = 1
RANGE bit = 0
RANGE bit = 1
VDD = 3 V
VDD = 5 V
VCM = common-mode voltage³ = VREF/2
VCM = VREF, VIN+ or VIN− must remain within GND/VDD
When in track
When in hold