Rainbow Electronics ADC08L060 - Manual (Page 3)

Pin Descriptions and Equivalent Circuits
Pin No. Symbol Equivalent Circuit Description
6 V
IN
Analog signal input. Conversion range is V
RB
to V
RT
.
3 V
RT
Analog Input that is the high (top) side of the reference
ladder of the ADC. Nominal range is 0.5V to V
A
. Voltage
on V
RT
and V
RB
inputs define the V
IN
conversion range.
Bypass well. See Section 2.0 for more information.
9 V
RM
Mid-point of the reference ladder. This pin should be
bypassed to a quiet point in the analog ground plane with
a 0.1 µF capacitor.
10 V
RB
Analog Input that is the low side (bottom) of the
reference ladder of the ADC. Nominal range is 0.0V to
(V
RT
– 0.5V). Voltage on V
RT
and V
RB
inputs define the
V
IN
conversion range. Bypass well. See Section 2.0 for
more information.
23 PD
Power Down input. When this pin is high, the converter is
in the Power Down mode and the data output pins hold
the last conversion result.
24 CLK
CMOS/TTL compatible digital clock Input. V
IN
is sampled
on the rising edge of CLK input.
13 thru 16
and
19 thru 22
D0–D7
Conversion data digital Output pins. D0 is the LSB, D7 is
the MSB. Valid data is output after the rising edge of the
CLK input.
7 V
IN
GND Reference ground for the single-ended analog input, V
IN
.
1, 4, 12 V
A
Positive analog supply pin. Connect to a quiet voltage
source of +3V. V
A
should be bypassed with a 0.1 µF
ceramic chip capacitor for each pin, plus one
10 µF capacitor. See Section 3.0 for more information.
18 V
DR
Power supply for the output drivers. If connected to V
A
,
decouple well from V
A
.
17 DR GND The ground return for the output driver supply.
2, 5, 8, 11 AGND The ground return for the analog supply.
ADC08L060
www.national.com 3