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SP8538AN Datasheet(PDF) 5 Page - Sipex Corporation

Part # SP8538AN
Description  Micropower Sampling 12-Bit A/D Converter
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP8538AN Datasheet(HTML) 5 Page - Sipex Corporation

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SP8538DS/01
SP8538 Micropower Sampling 12-Bit A/D Converter
© Copyright 1999 Sipex Corporation
5
The device uses a capacitive DAC architecture
which provides the sampling behavior. This
results in full Nyquist performance at the
fastest throughput rate (25 KHz) the device is
capable of.
The power supply voltage is variable from 3.0V
to 5.5V which provides supply flexibility. At the
5.0V supply level, conversion plus sampling
time is 40
µS and supply current is 250µA (1.25
mW). With a 3.3V supply the conversion plus
sampling time is 170
µS and current is reduced
to 150
µA (0.5 mW).
The device features automatic shutdown and
will shutdown to a +0.5
µA power level as CS
is brought high (de-selected). Power is
proportional to conversion duty cycle and
varies from 250
µA at 40µS (Duty cycle =
100%) to 6.25
µa at 1.6 ms (Duty cycle = 2.5%).
Examples:
Conversion rate
I
CC @ 5V
Duty Cycle
40
µS
250
µA
100%
80
µS
125
µA
50%
160
µS
62.5
µA
25%
DESCRIPTION
The SP8538 is a 12 bit sampling ADC with a
programmable two channel multiplexer and
serial data interface. The ADC samples and
converts 12 bits of data in 40
µS with a 5V
supply voltage applied. The SP8538 will also
operate at a 3.3V supply at 170
µS throughput.
The device automatically shuts down to a
+0.5
µA (MAX) level as soon as the chip is
deselected (CS=1). Serial data output is
available in an MSB first or LSB first format.
FEATURES
Two program bits, which are shifted into the
device prior to conversion, determine the input
configuration. In the single ended MUX
configuration the input signal will be applied to
either channel 0 or channel 1 and will be ground
referenced. The maximum full scale range is
VCC. In the full differential mode, the signal
will be applied between channel 0 and channel
1. The signals applied at each input may both
be dynamic. This is in contrast with pseudo
differential devices which must have input low
held at a constant level during conversion. The
converter will provide significant common mode
rejection when used in full differential manner.
Both inputs must remain between ground and
VCC for proper conversion.
0DRESSING
Mux Addressing
Channel #
GND
Comments
SGL/DIFF
ODD/SIGN
0
1
00
V
INH
V
INL
Full Differential Mode
01
V
INL
V
INH
10
V
INH
V
INL
Single Ended Mux Mode
11
V
INH
V
INL
INPUT VOLTAGE
INPUT VOLTAGE
OUTPUT
(V
INH-VINL)*
AT V
CC/VREF = 5V
CODE
0 LSB
0V
000000000000
1 LSB
0.00122V
000000000001
2048 LSB
2.5000V
100000000000
4094 LSB
4.9976V
111111111110
4095 LSB
4.9988V
111111111111
* See Mux Addressing Table for a definition of V
INH - VINL.
ADC TRANSFER FUNCTION


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