AD9708
–4–
REV. B
ABSOLUTE MAXIMUM RATINGS*
With
Parameter Respect to Min Max Units
AVDD ACOM –0.3 +6.5 V
DVDD DCOM –0.3 +6.5 V
ACOM DCOM –0.3 +0.3 V
AVDD DVDD –6.5 +6.5 V
CLOCK, SLEEP DCOM –0.3 DVDD + 0.3 V
Digital Inputs DCOM –0.3 DVDD + 0.3 V
IOUTA, IOUTB ACOM –1.0 AVDD + 0.3 V
COMP1, COMP2 ACOM –0.3 AVDD + 0.3 V
REFIO, FSADJ ACOM –0.3 AVDD + 0.3 V
REFLO ACOM –0.3 +0.3 V
Junction Temperature +150 °C
Storage Temperature –65 +150 °C
Lead Temperature
(10 sec) +300 °C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum
ratings for extended periods may effect device reliability.
THERMAL CHARACTERISTICS
Thermal Resistance
28-Lead 300 mil SOIC
θ
JA
= 71.4°C/W
θ
JC
= 23°C/W
28-Lead TSSOP
θ
JA
= 97.9°C/W
θ
JC
= 14.0°C/W
PIN CONFIGURATION
14
13
12
11
17
16
15
20
19
18
10
9
8
1
2
3
4
7
6
5
TOP VIEW
(Not to Scale)
28
27
26
25
24
23
22
21
AD9708
NC = NO CONNECT
(MSB) DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
NC
NC
NC
NC
NC
NC
CLOCK
DVDD
DCOM
NC
AVDD
COMP2
IOUTA
IOUTB
ACOM
COMP1
FS ADJ
REFIO
REFLO
SLEEP
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the AD9708 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
PIN FUNCTION DESCRIPTIONS
Pin No. Name Description
1 DB7 Most Significant Data Bit (MSB).
2–7 DB6–DB1 Data Bits 1–6.
8 DB0 Least Significant Data Bit (LSB).
9–14, 25 NC No Internal Connection.
15 SLEEP Power-Down Control Input. Active
High. Contains active pull-down circuit,
thus may be left unterminated if not
used.
16 REFLO Reference Ground when Internal 1.2 V
Reference Used. Connect to AVDD to
disable internal reference.
17 REFIO Reference Input/Output. Serves as
reference input when internal reference
disabled (i.e., Tie REFLO to AVDD).
Serves as 1.2 V reference output when
internal reference activated (i.e., Tie
REFLO to ACOM). Requires 0.1 µF
capacitor to ACOM when internal
reference activated.
18 FS ADJ Full-Scale Current Output Adjust.
19 COMP1 Bandwidth/Noise Reduction Node.
Add 0.1 µF to AVDD for optimum
performance.
20 ACOM Analog Common.
21 IOUTB Complementary DAC Current Output.
Full-scale current when all data bits
are 0s.
22 IOUTA DAC Current Output. Full-scale
current when all data bits are 1s.
23 COMP2 Internal Bias Node for Switch Driver
Circuitry. Decouple to ACOM with
0.1 µF capacitor.
24 AVDD Analog Supply Voltage (+2.7 V to
+5.5 V).
26 DCOM Digital Common.
27 DVDD Digital Supply Voltage (+2.7 V to
+5.5 V).
28 CLOCK Clock Input. Data latched on positive
edge of clock.
ORDERING GUIDE
Temperature Package Package
Model Range Descriptions Options*
AD9708AR –40°C to +85°C 28-Lead 300 Mil SOIC R-28
AD9708ARU –40°C to +85°C 28-Lead TSSOP RU-28
AD9708-EB Evaluation Board
*R = Small Outline IC; RU = Thin Small Outline IC.
WARNING!
ESD SENSITIVE DEVICE
