Datasheet


SLAS412− DECEMBER 2003
www.ti.com
37
BIT FUNCTIONRESET VALUE
READ/
WRITE
NAME
D7−D6 ADAVG R/W 00 Converter Averaging Control. These two bits allow you to specify the number of averages
the converter performs selected by bit D0, which selects either mean filter or
median filter.
Mean Filter Median filter
00 => No average No average
01 => 4−data average 5-data average
10 => 8−data average 9-data average
11 => 16−data average 15-data average
D5−D4 ADCR R/W 00 Conversion Rate Control. These two bits specify the internal clock rate which the A/D
converter uses to perform a single conversion. These bits are the same whether
reading or writing.
where f
INTCLK
is the internal clock frequency. For example, with 12-bit resolution and
a
2-MHz internal clock frequency, the conversion time is 8.0 µs. This yields an effective
throughput rate of 125 kHz.
00 => 8-MHz internal clock rate (use for 8-bit resolution only)
01 => 4-MHz internal clock rate (use for 8-bit/10-bit resolution only)
10 => 2-MHz internal clock rate
11 => 1-MHz internal clock rate
t
conv
+
N
)
4
ƒ
INTCLK
D3−D1 R 000 Reserved.
D0 AVGFS R/W 0 Average Filter select
0 => Mean filter
1 => Median filter