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TLV2548CDWG4 Datasheet(PDF) 6 Page - Texas Instruments

Part # TLV2548CDWG4
Description  2.7 V TO 5.5 V, 12-BIT, 200 KSPS, 4/8 CHANNEL, LOW POWER, SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLV2548CDWG4 Datasheet(HTML) 6 Page - Texas Instruments

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TLV2544, TLV2548
2.7V TO 5.5V, 12BIT, 200KSPS, 4/8CHANNEL, LOW POWER
SERIAL ANALOGTODIGITAL CONVERTERS WITH AUTOPOWERDOWN
SLAS198E − FEBRUARY 1999 − REVISED JUNE 2003
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
control and timing
power up and initialization requirements
D Determine processor type by writing A000h to the TLV2544/48 (CS must be toggled)
D Configure the device (CS must make a high-to-low transition, then can be held low if in DSP mode; i.e.,
active FS.)
The first conversion after power up or resuming from power down is not valid.
start of the cycle:
D When FS is not used (FS = 1 at the falling edge of CS), the falling edge of CS is the start of the cycle.
D When FS is used (FS is an active signal from a DSP), the falling edge of FS is the start of the cycle.
first 4-MSBs: the command register (CMR)
The TLV2544/TLV2548 have a 4-bit command set (see Table 1) plus a 12-bit configuration data field. Most of
the commands require only the first 4 MSBs, i.e., without the 12-bit data field.
The valid commands are listed in Table 1.
Table 1. TLV2544/TLV2548 Command Set
SDI D(15−12) BINARY
TLV2548 COMMAND
TLV2544 COMMAND
0000b
0h
Select analog input channel 0
Select analog input channel 0
0001b
1h
Select analog input channel 1
N/A
0010b
2h
Select analog input channel 2
Select analog input channel 1
0011b
3h
Select analog input channel 3
N/A
0100b
4h
Select analog input channel 4
Select analog input channel 2
0101b
5h
Select analog input channel 5
N/A
0110b
6h
Select analog input channel 6
Select analog input channel 3
0111b
7h
Select analog input channel 7
N/A
1000b
8h
SW power down (analog + reference)
1001b
9h
Read CFR register data shown as SDO D(11−0)
1010b
Ah plus data
Write CFR followed by 12-bit data, e.g., 0A100h means external reference,
short sampling, SCLK/4, single shot, INT
1011b
Bh
Select test, voltage = (REFP+REFM)/2
1100b
Ch
Select test, voltage = REFM
1101b
Dh
Select test, voltage = REFP
1110b
Eh
FIFO read, FIFO contents shown as SDO D(15−4), D(3−0) = 0000
1111b
Fh plus data
Reserved
1111b
Fh plus data
Reserved
NOTE: The status of the CFR can be read with a read CFR command when the device is programmed
for one-shot conversion mode (CFR D[6,5] = 00).


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