ADCS7477AIMFX datasheet(18/22 Pages) NSC

Part #	ADCS7477AIMFX

Description	1MSPS, 12-/10-/8-Bit A/D Converters in 6-Lead SOT-23

PDF	22 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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18 / 22 page

Applications Information (Continued)

the first SCLK edge after CS goes low is a rising edge, all

four leading zeroes will be valid on the first four falling edges

of SCLK. If instead the first SCLK edge after CS goes low is

a falling edge, the first leading zero may not be set up in time

for a microprocessor or DSP to read it correctly. The remain-

ing data bits are still clocked out on the falling edges of

SCLK.

3.0 ADCS7476/77/78 TRANSFER FUNCTION

The output format of the ADCS7476/77/78 is straight binary.

Code transitions occur midway between successive integer

LSB values. The LSB widths for the ADCS7476 is V

DD /

4096; for the ADCS7477 the LSB width is V

DD / 1024; for the

ADCS7478, the LSB width is V

DD / 256. The ideal transfer

characteristic for the ADCS7476 and ADCS7477 is shown in

Figure 6, while the ideal transfer characteristic for the

ADCS7478 is shown in Figure 7.

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FIGURE 6. ADCS7476/77 Ideal Transfer Characteristic

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FIGURE 7. ADCS7478 Ideal Transfer Characteristic

ADCS7477AIMFX Datasheet(PDF) 18 Page - National Semiconductor (TI)