AD420AR-32-REEL Analog Devices Inc, AD420AR-32-REEL Datasheet - Page 6

• Manufacturer Part Number: AD420AR-32-REEL
• Description: IC,D/A CONVERTER,SINGLE,16-BIT,BICMOS,SOP,24PIN
• Manufacturer: Analog Devices Inc

Specifications of AD420AR-32-REEL

• Rohs Status: RoHS non-compliant
• Settling Time: 2.5µs
• Number Of Bits: 16
• Data Interface: Serial
• Number Of Converters: 1
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 176mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)

AD420
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 4. Pin Function Descriptions
Pin No.
1, 12,
13, 24
2
3
4
5
6
7
8
9
10
11
14
15
16
17
18
19
20
21
22
23
Mnemonic
NC
V
FAULT DETECT
RANGE SELECT 2
RANGE SELECT 1
CLEAR
LATCH
CLOCK
DATA IN
DATA OUT
GND
REF OUT
REF IN
OFFSET TRIM
V
I
BOOST
CAP 1
CAP 2
NC
V
OUT
LL
OUT
CC
Function
No Connection. No internal connections inside device.
Auxiliary buffered +4.5 V digital logic voltage. This pin is the internal supply voltage for the digital
circuitry and can be used as a termination for pull-up resistors. An external +5 V power supply can be
connected to V
V
section.
FAULT DETECT, connected to a pull-up resistor, is asserted low when the output current does not match
the DAC’s programmed value, for example, in case the current loop is broken.
Selects the converter’s output operating range. One output voltage range and three
output current ranges are available.
Valid V
is removed the DAC output will remain at this value. The data in the input register is unaffected.
In the 3-wire interface mode a rising edge parallel loads the serial input register data into the DAC. To
use the asynchronous mode connect LATCH through a current limiting resistor to V
Data Clock Input. The clock period is equal to the input data bit rate in the 3-wire interface mode and is
16 times the bit rate in asynchronous mode.
Serial Data Input.
Serial Data Output. In the 3-wire interface mode, this output can be used for daisy-chaining multiple
AD420s. In the asynchronous mode a positive pulse will indicate a framing error after the stop-bit is
received.
Ground (Common).
+5 V Reference Output.
Reference Input.
Offset Adjust.
Voltage Output.
Current Output.
Connect to an external transistor to reduce the power dissipated in the AD420 output transistor, if
desired.
These pins are used for internal filtering. Connect capacitors between each of these
pins and V
No Connection. Do not connect anything to this pin.
Power Supply Input. The V
Power Supplies and Decoupling section.
LL
pin should be decoupled to GND with a 0.1 μF capacitor. See the Power Supplies and Decoupling
IH
unconditionally forces the output to go to the minimum of its programmed range. After CLEAR
CC
. Refer to the description of current output operation.
RANGE SELECT 2
RANGE SELECT 1
FAULT DETECT
LL
. It will override this buffered voltage, thus reducing the internal power dissipation. The
DATA OUT
DATA IN
CLOCK
CLEAR
LATCH
GND
Figure 2. Pin Configuration
V
NC
NC
LL
CC
Rev. H | Page 6 of 16
10
12
11
NC = NO CONNECT
1
2
3
4
5
6
7
8
9
pin should always be decoupled to GND with a 0.1 μF capacitor. See the
(Not to Scale)
TOP VIEW
AD420
24
23
22
21
20
19
18
17
16
15
14
13
NC
V
NC
CAP 2
CAP 1
BOOST
I
V
OFFSET TRIM
REF IN
REF OUT
NC
OUT
CC
OUT
CC
.