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TLV2541 Datasheet(PDF) 4 Page - Texas Instruments

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Part No. TLV2541
Description  2.7 V TO 5.5 V, LOW POWER, 12-BIT, 200 KSPS, SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTOPOWER DOWN
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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TLV2541 Datasheet(HTML) 4 Page - Texas Instruments

 
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TLV2541, TLV2542, TLV2545
2.7 V TO 5.5 V, LOW POWER, 12-BIT, 200 KSPS,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTOPOWER DOWN
SLAS245 –MARCH 2000
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
GND/AIN(–)
ADC Code
AIN
Charge
Redistribution
DAC
Control
Logic
_
+
Figure 1. Simplified SAR Circuit
serial interface
OUTPUT DATA FORMAT
MSB
LSB
D15–D4
D3–D0
Conversion result (OD11–OD0)
Don’t care
The output data format is binary (unipolar straight binary).
binary
Zero scale code = 000h, Vcode = GND
Full scale code = FFFh, Vcode = VREFP – 1 LSB
pseudo-differential inputs
The TLV2545 operates in pseudo-differential mode. The inverted input is available on pin 5. It can have a
maximum input ripple of
±0.2 V. This is normally used for ground noise rejection.
control and timing
start of the cycle
TLV2541
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. Output
data changes on the rising edge of SCLK. This is typically used for a microcontroller with SPI interface,
although it can also be used for a DSP. The microcontroller SPI interface should be programmed for
CPOL=0 (serial clock referenced to ground) and CPHA=1 (data is valid on the falling edge of serial clock).
D When FS is used ( FS is an active signal from a DSP), the falling edge of FS is the start of the cycle. Output
data changes on the rising edge of SCLK. This is typically used for a TMS320 DSP. If the TLV2541 is
attached to a dedicated DSP serial port. CS terminal can be grounded.
TLV2542/5
The CS and FS inputs are accessed via the same pin (pin 1) on the TLV2542 and TLV2545. The cycle is started
by the falling edge transition provided by either a CS (interfacing with SPI microcontroller) signal or FS
(interfacing with TMS320 DSP) signal. Timing for the TLV2545 is much like the TLV2541, with the exception of
the CS/FS line.


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