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PDF SP8538 Data sheet ( Hoja de datos )
| Número de pieza | SP8538 | |
| Descripción | Micropower Sampling 12-Bit A/D Converter | |
| Fabricantes | Sipex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP8538 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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SIGNAL PROCESSING EXCELLENCE
SP8538
Micropower Sampling 12-Bit A/D Converter
s Low Cost
s 12-Bit Serial Sampling ADC
s Guaranteed +1.0 LSB Max INL
s Guaranteed No Missing Codes
s 8-Pin NSOIC Plastic Package
s Low Power @ 250µA including
Automatic Shutdown: 1nA(typ)
s Programmable Input Configuration:
Full differential or 2 channel
single-ended
s Single Supply 3.0V to 5.5V operation
s Half Duplex Digital Serial Interface
s Sample Rate: 40µS
s Pin Compatible Upgrade to LTC 1298
DESCRIPTION
The SP8538 is a very low power 12-Bit data acquisition chip. The SP8538 typically draws 250µA
of supply current when sampling at 25 kHz. Supply current drops linearly as the sample rate is
reduced. The ADC automatically powers down when not performing conversions, drawing only
leakage current. The SP8538 is available in 8-Pin NSOIC packages, specified over Commercial
and Industrial temperature ranges. The SP8538 is best suited for Battery-Operated Systems,
Portable Data Acquisition Instrumentation, Battery Monitoring, and Remote Sensing
applications. The serial port allows efficient data transfer to a wide range of microprocessors and
microcontrollers over 3 or 4 wires.
GND
VCC
REFL
REFH
Internal
VCC
12
CH0
CH1
DIN
MUX
INPUT
DATA
REG
REFL
DAC
REFH
Csample P
Csample N
COMPARATOR
SAR
PARALLEL TO
SERIAL SHIFT
REGISTER
Dout
CS
CLK
SP8538 Block Diagram
SP8538DS/01
TIMING &
CONTROL LOGIC
SP8538 Micropower Sampling 12-Bit A/D Converter
1
© Copyright 1999 Sipex Corporation
1 page  
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 170µS 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.
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 40µS and supply current is 250µA (1.25
mW). With a 3.3V supply the conversion plus
sampling time is 170µS and current is reduced
to 150µA (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 6.25µa at 1.6 ms (Duty cycle = 2.5%).
Examples:
Conversion rate
40 µS
80 µS
160 µS
ICC @ 5V
250 µA
125 µA
62.5 µA
Duty Cycle
100%
50%
25%
0DRESSING
Mux Addressing
SGL/DIFF ODD/SIGN
00
01
10
11
Channel #
01
VINH
VINL
VINH
VINL
VINH
VINH
GND
VINL
VINL
Comments
Full Differential Mode
Single Ended Mux Mode
ADC TRANSFER FUNCTION
INPUT VOLTAGE
(V -V )*
INH INL
0 LSB
1 LSB
2048 LSB
4094 LSB
4095 LSB
INPUT VOLTAGE
AT V /V = 5V
CC REF
0V
0.00122V
2.5000V
4.9976V
4.9988V
OUTPUT
CODE
000000000000
000000000001
100000000000
111111111110
111111111111
* See Mux Addressing Table for a definition of VINH - VINL.
SP8538DS/01
SP8538 Micropower Sampling 12-Bit A/D Converter
5
© Copyright 1999 Sipex Corporation
5 Page 
PACKAGE: PLASTIC
SMALL OUTLINE (SOIC)
(NARROW)
EH
D
eB
A
A1
h x 45°
Ø
L
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
8–PIN
A 0.053/0.069
(1.346/1.748)
14–PIN
16–PIN
0.053/0.069 0.053/0.069
(1.346/1.748) (1.346/1.748)
A1 0.004/0.010 0.004/0.010 0.004/0.010
(0.102/0.249 (0.102/0.249) (0.102/0.249)
B 0.014/0.019 0.013/0.020 0.013/0.020
(0.35/0.49) (0.330/0.508) (0.330/0.508)
D 0.189/0.197 0.337/0.344 0.386/0.394
(4.80/5.00) (8.552/8.748) (9.802/10.000)
E 0.150/0.157 0.150/0.157 0.150/0.157
(3.802/3.988) (3.802/3.988) (3.802/3.988)
e 0.050 BSC 0.050 BSC 0.050 BSC
(1.270 BSC) (1.270 BSC) (1.270 BSC)
H 0.228/0.244 0.228/0.244 0.228/0.244
(5.801/6.198) (5.801/6.198) (5.801/6.198)
h 0.010/0.020 0.010/0.020 0.010/0.020
(0.254/0.498) (0.254/0.498) (0.254/0.498)
L 0.016/0.050 0.016/0.050 0.016/0.050
(0.406/1.270) (0.406/1.270) (0.406/1.270)
Ø
0°/8°
0°/8°
0°/8°
(0°/8°)
(0°/8°)
(0°/8°)
SP8538DS/01
SP8538 Micropower Sampling 12-Bit A/D Converter
11
© Copyright 1999 Sipex Corporation
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SP8538.PDF ] | |
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