Datasheet
ADS8556
ADS8557
ADS8558
SBAS404B –OCTOBER 2006– REVISED JANUARY 2012
www.ti.com
ELECTRICAL CHARACTERISTICS: ADS8556
Over recommended operating free-air temperature range of –40°C to +125°C, AVDD = 4.5V to 5V, BVDD = 2.7V to 5.5V,
HVDD = 10V to 15V, HVSS = –15V to –10V, V
REF
= 2.5V (internal), and f
DATA
= 630kSPS in parallel mode or 450kSPS in
serial mode, unless otherwise noted.
ADS8556
PARAMETER CONDITIONS MIN TYP
(1)
MAX UNIT
DC ACCURACY
Resolution 16 Bits
No missing codes 16 Bits
At T
A
= –40°C to +85°C –3 ±1.5 3 LSB
Integral linearity error INL
At T
A
= –40°C to +125°C –4 ±1.5 4 LSB
At T
A
= –40°C to +85°C –1 ±0.75 1.5 LSB
Differential linearity error DNL
At T
A
= –40°C to +125°C –1 ±0.75 2 LSB
Offset error –4.0 ±0.8 4.0 mV
Offset error drift ±3.5 μV/°C
Gain error Referenced to voltage at REFIO –0.75 ±0.25 0.75 %FSR
Gain error drift Referenced to voltage at REFIO ±6 ppm/°C
Power-supply rejection ratio PSRR At output code FFFFh, related to AVDD 60 dB
SAMPLING DYNAMICS
Acquisition time t
ACQ
280 ns
Conversion time per ADC t
CONV
1.26 μs
18.5 t
CCLK
Internal conversion clock period t
CCLK
68.0 ns
Parallel interface,
630 kSPS
internal clock and reference
Throughput rate f
DATA
Serial interface,
450 kSPS
internal clock and reference
AC ACCURACY
At f
IN
= 10kHz, T
A
= –40°C to +85°C 90 91.5 dB
Signal-to-noise ratio SNR
At f
IN
= 10kHz, T
A
= –40°C to +125°C 89 91.5 dB
At f
IN
= 10kHz, T
A
= –40°C to +85°C 87 89.5 dB
Signal-to-noise ratio + distortion SINAD
At f
IN
= 10kHz, T
A
= –40°C to +125°C 86.5 89.5 dB
At f
IN
= 10kHz, T
A
= –40°C to +85°C –94 –90 dB
Total harmonic distortion
(2)
THD
At f
IN
= 10kHz, T
A
= –40°C to +125°C –94 –89.5
At f
IN
= 10kHz, T
A
= –40°C to +85°C 90 95 dB
Spurious-free dynamic range SFDR
At f
IN
= 10kHz, T
A
= –40°C to +125°C 89.5 95 dB
Channel-to-channel isolation At f
IN
= 10kHz 100 dB
In 4 × V
REF
mode 48 MHz
–3dB small-signal bandwidth
In 2 × V
REF
mode 24 MHz
(1) All values are at T
A
= +25°C.
(2) Calculated on the first nine harmonics of the input frequency.
4 Copyright © 2006–2012, Texas Instruments Incorporated