SP8503, SP8505, SP8510
12-Bit Sampling A/D Converters
s 3µs, 5µs or 10µs Sample/Conversion
Time
s Standard ±10V and ±5V Input
s No Missing Codes Over Temperature
s AC Performance Over Temperature
71.5dB Signal–to–Noise Ratio at Nyquist
85dB Spurious–free Dynamic Range
at 49kHz
–81dB Total Harmonic Distortion at 49kHz
s Internal Sample/Hold, Reference,
Clock, and 3-State Outputs
s Low Power Dissipation: 90mW
s 28–Pin Narrow PDIP and SOIC
DESCRIPTION…
The SP85XX Series are complete 12-bit sampling A/D converters using state–of–the–art
CMOS structures. They contain a complete 12–bit successive approximation A/D converter
with internal sample/hold, reference, clock, digital interface for microprocessor control, and
three–state output drivers. Power dissipation is only 90mW. AC and DC performance are
completely specified. Sampling/conversion rates of 3µs, 5µs and 10µs are offered.
±10VIN
±5VIN
VREF Out
(1.2043V)
CS R/C HBE
Control
Logic
Clock
IBIP
CDAC.....
.....
Internal
Ref
.....
.....
SAR
Comparator
Output
Latches
And
Three
State
Drivers
BUSY
Three
State
Parallel
Output
Data
Bus
43