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| 型號(hào)： | TLV2548MPWREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | ADC |
| 英文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封裝： | GREEN, PLASTIC, TSSOP-20 |
| 文件頁(yè)數(shù)： | 33/37頁(yè) |
| 文件大小： | 915K |
| 代理商： | TLV2548MPWREP |
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SLAS668 – OCTOBER 2009
OUTPUT DATA FORMAT CONVERSION
MSB
LSB
D15
D4
D3
D0
Conversion result
Don’t care
OD[11:0]
The output data format is binary (unipolar straight binary).
Binary
Zero scale code = 000h, Vcode = VREFM.
Full scale code = FFFh, Vcode = VREFP
1 LSB
Control and Timing
Power Up and Initialization Requirements
Determine processor type by writing A000h to the TLV2548 (CS must be toggled).
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
When FS is not used (FS = 1 at the falling edge of CS), the falling edge of CS is the start of the cycle.
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 TLV2548 has a 4-bit command set (see Table 3) 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 3.
Table 3. TLV2548 Command Set(1)
SDI D(15
12) BINARY
COMMAND
0000b
0h
Select analog input channel 0
0001b
1h
Select analog input channel 1
0010b
2h
Select analog input channel 2
0011b
3h
Select analog input channel 3
0100b
4h
Select analog input channel 4
0101b
5h
Select analog input channel 5
0110b
6h
Select analog input channel 6
0111b
7h
Select analog input channel 7
1000b
8h
SW power down (analog + reference)
1001b
9h
Read CFR register data shown as SDO D(11-0)
Write CFR followed by 12–bit data, e.g., 0A100h means external reference,
1010b
Ah plus data
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
(1)
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).
Copyright 2009, Texas Instruments Incorporated
5
Product Folder Link(s): TLV2548-EP
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