Datasheet
ADS7863
SBAS383E –JUNE 2007–REVISED JANUARY 2011
www.ti.com
ELECTRICAL CHARACTERISTICS
At T
A
= –40°C to +125°C, entire power-supply range, V
REF
= 2.5V (internal), f
CLK
= 32MHz, and t
DATA
= 2MSPS, unless
otherwise noted.
ADS7863
PARAMETER TEST CONDITIONS MIN TYP
(1)
MAX UNIT
RESOLUTION 12 Bits
ANALOG INPUT
FSR Full-scale differential input range (CHxx+) – (CHxx–) –V
REF
+V
REF
V
V
IN
Absolute input voltage CHxx+ or CHxx+ to AGND –0.1 AV
DD
+ 0.1 V
C
IN
Input capacitance CHxx+ or CHxx– to AGND 2 pF
C
ID
Differential input capacitance 4 pF
I
IL
Input leakage current –1 +1 nA
CMRR Common-mode rejection ratio Both ADCs, dc to 100kHz 72 dB
DC ACCURACY
–40°C < T
A
< +125°C –1.25 ±0.6 +1.25 LSB
INL Integral nonlinearity
–40°C < T
A
< +85°C –1 ±0.5 +1 LSB
DNL Differential nonlinearity –1 ±0.5 +1 LSB
V
OS
Input offset error –3 ±0.5 +3 LSB
V
OS
match –3 ±0.5 +3 LSB
dV
OS
/dT Input offset thermal drift ±3 mV/°C
G
ERR
Gain error Referred to voltage at REFIN –0.5 +0.5 %
G
ERR
match –0.5 ±0.1 +0.5 %
G
ERR
/dT Gain error thermal drift Referred to voltage at REFIN ±1 ppm/°C
PSRR Power-supply rejection ratio AV
DD
= 5.5V 70 dB
AC ACCURACY
SINAD Signal-to-noise + distortion V
IN
= 5V
PP
at 100kHz 69.8 71 dB
SNR Signal-to-noise ratio V
IN
= 5V
PP
at 100kHz 70 71.5 dB
THD Total harmonic distortion V
IN
= 5V
PP
at 100kHz –81 –76 dB
SFDR Spurious-free dynamic range V
IN
= 5V
PP
at 100kHz 76 84 dB
SAMPLING DYNAMICS
t
CONV
Conversion time per ADC 1MHz < f
CLK
≤ 32MHz 16 t
CLK
t
ACQ
Acquisition time 2 t
CLK
t
DATA
Data rate 1MHz < f
CLK
≤ 32MHz 62.5 2000 kSPS
t
A
Aperture delay 6 ns
t
A
match 50 ps
t
AJIT
Aperture jitter 50 ps
f
CLK
Clock frequency on CLOCK 1 32 MHz
T
CLK
Clock period 31.25 1000 ns
INTERNAL VOLTAGE REFERENCE
Resolution Reference output DAC resolution 10 Bits
Over 20%...100% DAC range 0.2V
REFOUT
V
REFOUT
V
DAC = 0x3FF,
V
REFOUT
Reference output voltage 2.485 2.500 2.515 V
–40°C < T
A
< +125°C
DAC = 0x3FF at +25°C 2.495 2.500 2.505 V
dV
REFOUT
/dT Reference voltage drift ±10 ppm/°C
–9.76 ±2.44 9.76 mV
DNL
DAC
DAC differential nonlinearity
–4 ±1 4 LSB
–9.76 ±1.22 9.76 mV
INL
DAC
DAC integral nonlinearity
–4 ±0.5 4 LSB
–9.76 ±2.44 9.76 mV
V
OSDAC
DAC offset error V
REFOUT
= 0.5V
–4 ±1 4 LSB
(1) All typical values at T
A
= +25°C.
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