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PDF SP8542BS Data sheet ( Hoja de datos )
| Número de pieza | SP8542BS | |
| Descripción | Two and Four Channel 12-Bit Multiplexed Sampling ADCs | |
| Fabricantes | Sipex | |
| Logotipo |  |
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® SP8542/SP8544
Two and Four Channel 12-Bit Multiplexed
Sampling ADCs
s Two or Four Channel Input Mux
s 12 Bit Resolution
s Single +5Volt Supply
s Internal 1.25 Volt Reference
s Unipolar 0 to +2.5 Volt Input Range
s Fast, 3.75 µs Conversion Time per Channel
s Fast Power Shutdown/Turn-On Mode
s 3-Wire Synchronous Serial High Speed
Interface
s 2µA Shutdown Mode (10µW)
s Low Power CMOS 42mW typical
DESCRIPTION
The SP8542 (2 channel) and SP8544 (4 channel) are 12-Bit serial in/out data acquisition systems
with a bi-directional serial interface. The devices contain a high speed 12-Bit analog to digital
converter, internal reference, and a 2 or 4 channel input mux which drives the internal sample/
hold circuitry. The SP8542 is available in 16-pin PDIP and SOIC packages, and the SP8544
is available in 18-pin PDIP and SOIC packages, specified over Commercial and Industrial
temperature ranges.
CS
SCLK
DIN
CH0
CH1
*CH2
*CH3
OFFSET
ADJUST
SHUTDOWN
CONTROL
LOGIC
MUX
Register
MUX
COUNTER
SAR
RTRIM
CDAC
REF.
BUFFER
STATUS
LATCHED
COMPARATOR
DOUT
GAIN
ADJUST
REF OUT
SP8542 - 2 CHANNEL MUX
*SP8544 - 4 CHANNEL MUX
SP8542/8544DS/01
SP8542/8544 Two and Four Channel 12-Bit Multiplexed Sampling ADC's
1
© Copyright 2000 Sipex Corporation
1 page  
SP8542 PIN ASSIGNMENTS
Pin 1-N.C.-No Connection
Pin 2-CH0-Analog Mux Input 0
Pin 3-CH1-Analog Mux Input 1
Pin 4-AGND-Analog Ground
Pin 5-VSS Digital Ground
Pin 6-SCLK-Serial Clock Input
Pin 7-DOUT Digital Data Output
Pin 8-DIN Mux Channel Selection Input
Pin 9-Status
Pin 10-CS-Chip Select Bar Input, High
Deselects chip, Low Selects chip
Pin 11-SD-Shutdown Input, logic low = power
up, logic high = powerdown
Pin 12-VDD Digital +5V supply
Pin 13-VDA Analog +5V supply
Pin 14-OffADJ External Offset Adjust
Pin 15-Refout-Voltage Reference Output
Pin 16-GAINADJ-External Gain Adjustment
SP8544 PIN ASSIGNMENTS
Pin 1-N.C.-No Connection
Pin 2-CH0-Analog Mux Input 0
Pin 3-CH1-Analog Mux Input 1
Pin 4-CH2-Analog Mux Input 2
Pin 5-CH3-Analog Mux Input 3
Pin 6-AGND-Analog Ground
Pin 7-VSS Digital Ground
Pin 8-SCLK-Serial Clock Input
Pin 9-DOUT Digital Data Output
Pin 10-DIN Mux Channel Selection Input
Pin 11-Status
Pin 12-CS-Chip Select Bar Input, High
Deselects chip, Low Selects chip
Pin 13-SD-Shutdown Input, logic low = power
up, logic high = powerdown
Pin 14-VDD Digital +5V supply
Pin 15-VDA Analog +5V supply
Pin 16-OffADJ External Offset Adjust
Pin 17-Refout-Voltage Reference Output
Pin 18-GAINADJ-External Gain Adjustment
N.C. 1
CH0 2
CH1 3
AGND 4
VSS 5
SCLK 6
DOUT 7
DIN 8
16 GAIN ADJUST
15 REF OUT
14 OFFSET ADJ.
13 VDA
SP8542 12 VDD
11 SD
10 CS
9 STATUS
N.C. 1
CH0 2
CH1 3
CH2 4
CH3 5
AGND 6
VSS 7
SCLK 8
DOUT 9
18 GAIN ADJUST
17 REF OUT
16 OFFSET ADJ.
15 VDA
SP8544 14 VDD
13 SD
12 CS
11 STATUS
10 DIN
SP 8542 Channel Selection
Truth Table
MA0
0
1
Channel Selection
CH0
CH1
SP 8544 Channel Selection
Truth Table
MA1
0
0
1
1
MA0
0
1
0
1
Channel Selection
CH0
CH1
CH2
CH3
SP8542/8544DS/01
SP8542/8544 Two and Four Channel 12-Bit Multiplexed Sampling ADC's
5
© Copyright 2000 Sipex Corporation
5 Page 
15 16 17 1 2 3 4 5 6
SCLK
15 16 17 1 2 3 4 5 6
15 16 17 1 2
CS = 0
STATUS
DATA D1 D0
HI-Z
DATA WORD N
D11 D10
D1 D0
HI-Z DATA WORD (N+1)
D11 D10
D1 D0
DIN MA0
PROGRAM BIT FOR WORD (N + 1)
MA0
PROGRAM BIT FOR WORD (N + 2)
MA1 MA0
tDISU
SCLK 17
tDSS
tAPS
tDIH
1
tSKL
tSKH tSKT
23
4
tSD
5
6
tDSE
tBR
15 16 17
1
CS = 0
STATUS
DATA
DIN
MA0
MODE AQUIRE
D11 D10
tC
CONVERT
D1 D0
tA
AQUIRE
MA1
CONVERT
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SP8542BS.PDF ] | |
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