ADS7863
www.ti.com
SBAS383–JUNE 2007
ELECTRICAL CHARACTERISTICS
At TA = –40°C to +125°C, and AVDD = 5V, BVDD = 3.3V, VREF = 2.5V (internal), fCLK = 24MHz, and fSAMPLE = 1.5MSPS, unless
otherwise noted.
ADS7863
PARAMETER
TEST CONDITIONS
MIN
TYP(1)
MAX
UNIT
RESOLUTION
12
Bits
ANALOG INPUT
FSR
VIN
Full-scale differential input range
Absolute input voltage
(CHxx+) – (CHxx–)
–VREF
–0.1
+VREF
V
CHxx+ or CHxx+ to AGND
CHxx+ or CHxx– to AGND
AVDD + 0.1
V
CIN
Input capacitance
2
4
pF
pF
nA
dB
CID
Differential input capacitance
Input leakage current
IIL
–1
+1
CMRR
Common-mode rejection ratio
80
DC ACCURACY
INL
Integral nonlinearity
–1
–1
–1
+1
+1
+1
LSB
LSB
LSB
LSB
LSB
LSB
μV/°C
%
INL match
DNL
Differential nonlinearity(2)
Input offset error
DNL match
VOS
VOS match
dVOS/dT
GERR
Asynchronous to Synchronous
Input offset thermal drift
Gain error(2)
0.25
GERR match
GERR/dT
PSRR
%
Gain error thermal drift
ppm/°C
dB
Power-supply rejection ratio
2.7V < AVDD < 5.5V
70
AC ACCURACY
SINAD
SNR
Signal-to-noise + distortion
VIN = 5VPP at 100kHz
VIN = 5VPP at 100kHz
VIN = 5VPP at 100kHz
VIN = 5VPP at 100kHz
70
75
dB
dB
dB
dB
Signal-to-noise ratio
THD
Total harmonic distortion
Spurious-free dynamic range
–75
13
SFDR
SAMPLING DYNAMICS
tCONV Conversion time per ADC
tACQ
tDATA
tA
1MHz < fCLK ≤ 24MHz
1MHz < fCLK ≤ 24MHz
0.542
125
μs
ns
Acquisition time
Throughput rate
Aperture delay
62.5
1500
6
kSPS
ns
tA match
tAJIT
50
50
ps
Aperture jitter
ps
fCLK
Clock frequency on CLOCK
1
24
MHz
INTERNAL VOLTAGE REFERENCE
Resolution
VREFOUT
Reference output DAC resolution
10
Bits
V
Over 20%...100% DAC range
0.496
2.520
2.520
2.515
DAC = 0x3FF,
–40°C < TA < +125°C
Reference output voltage
2.480
2.485
2.500
V
DAC = 0x3FF at +25°C
2.500
V
ppm/°C
mV
dVREFOUT/dT Reference voltage drift
±10
–9.76
–4
9.76
4
DNLDAC
INLDAC
VOSDAC
DAC differential nonlinearity
DAC integral nonlinearity
DAC offset error
LSB
mV
–9.76
–4
9.76
4
LSB
mV
9.76
4
VREFOUT = 0.5V
LSB
(1) All typical values at TA = +25°C.
(2) Ensured by design, not production tested.
4
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