AD7628 Analog Devices, AD7628 Datasheet - Page 2

• Manufacturer Part Number: AD7628
• Description: CMOS Dual 8-Bit Buffered Multiplying DAC
• Manufacturer: Analog Devices

Specifications of AD7628

• Resolution (bits): 8bit
• Dac Update Rate: 2.9MSPS
• Dac Settling Time: 350ns
• Max Pos Supply (v): +15.75V
• Single-supply: Yes
• Dac Type: Current Out
• Dac Input Format: Par

subject to test. V
Parameter
STATIC PERFORMANCE
DIGITAL INPUTS
SWITCHING CHARACTERISTICS
See Timing Diagram
POWER SUPPLY
Specifications subject to change without notice.
AC PERFORMANCE CHARACTERISTICS
Parameter
DC SUPPLY REJECTION
CURRENT SETTLING TIME
DIGITAL-TO-ANALOG GLITCH
IMPULSE
OUTPUT CAPACITANCE
AC FEEDTHROUGH
CHANNEL-TO-CHANNEL ISOLATION
DIGITAL CROSSTALK
HARMONIC DISTORTION
NOTES
1
2
3
4
Specifications subject to change without notice.
AD7628–SPECIFICATIONS
Temperature Ranges are K Version; –40 C to +85 C; B Version; –40 C to +85 C; T Version; –55 C to +125 C.
Specification applies to both DACs in AD7628.
Guaranteed by design but not production tested.
Logic inputs are MOS Gates. Typical input current (+25 C) is less than 1 nA.
Resolution
Relative Accuracy
Differential Nonlinearity
Gain Error
Gain Temperature Coefficient
Output Leakage Current
Input Resistance (V
V
Input High Voltage (V
Input Low Voltage (V
Input Current (I
Input Capacitance
Chip Select to Write Set Up Time (t
Chip Select to Write Hold Time (t
DAC Select to Write Set Up Time (t
DAC Select to Write Hold Time (t
Data Valid to Write Set Up Time (t
Data Valid to Write Hold Time (t
Write Pulse Width (t
I
( GAIN/ V
C
C
C
C
V
V
V
V
DD
REF
REF
REF
REF
REF
OUT
OUT
OUT
OUT
OUT A (Pin 2)
OUT B (Pin 20)
Match
DB0–DB7
WR, CS, DACA/DACB
B, T Grades
All Grades
, K Grade
Gain/ Temperature
A/V
A to OUT A
B to OUT B
A to OUT B
B to OUTA
A
B
A
B
REF
B Input Resistance
DD
)
IN
DD
4
)
= +10.8 V to +15.75 V. (Measured Using Recommended PC Board Layout (Figure 7) and AD644 as Output Amplifiers)
REF
WR
IL
IH
A, V
)
)
)
2
REF
3
B)
DH
CH
AH
3
DS
CS
)
AS
)
)
)
)
)
T
8
8
15
2.4
0.8
10
15
160
10
160
10
160
10
150
2
2
100
T
0.01
350
330
25
25
60
60
–70
–70
–80
–80
60
–85
A
1/2
1
2
50
50
1
1
A
= +25 C
= +25 C
1
1
T
to +85 C
8
8
15
2.4
0.8
10
15
160
10
160
10
160
10
170
2
2.5
500
T
to +85 C
0.02
400
25
25
60
60
–65
–65
A
1/2
1
3
0.0035
200
200
1
10
A
= –40 C
= –40 C
(V
otherwise noted)
DD
= +10.8 V to +15.75 V, V
1
These characteristics are included for Design Guidance only and are not
–2–
T
to +125 C
8
8
15
2.4
0.8
10
15
210
10
210
10
210
10
210
2.5
500
T
0.02
400
25
25
60
60
–65
–65
to +125 C
1/2
l
3
0.0035
200
200
1
10
A
A
= –55 C
= –55 C
1
1
Units
Bits
LSB max
LSB max
LSB max
%/ C max
nA max
nA max
k min
k max
% max
V min
V max
pF max
pF max
ns min
ns min
ns min
ns min
ns min
ns min
ns min
mA
mA
Units
% per % max
ns max
nV sec typ
pF max
pF max
pF max
pF max
dB max
dB max
dB typ
dB typ
nV sec typ
dB typ
A max
A
REF
A = V
REF
B = +10 V; OUT A = OUT B = 0 V unless
Test Conditions/Comments
This is an Endpoint Linearity Specification
All Grades Guaranteed Monotonic Over
Full Operating Temperature Range
Measured Using Internal RFB A and RFB B.
Both DAC Latches Loaded with 11111111.
Gain Error is Adjustable Using Circuits
of Figures 4 and 5.
DAC Latches Loaded with 00000000
Input Resistance TC = –300 ppm/ C, Typical
Input Resistance is 11 k
V
See Figure 3
All Digital Inputs V
All Digital Inputs V
All Digital Inputs 0 V or V
Test Conditions/Comments
To 1/2 LSB OutA/OutB Load = 100 .
WR = CS = 0 V.
DB0–DB7 = 0 V to V
For Code Transition 00000000 to 11111111
DAC Latches Loaded with 00000000
DAC Latches Loaded with 11111111
V
@ 10 kHz
Both DAC Latches Loaded with 11111111.
V
V
V
V
Measured for Code Transition 00000000
to 11111111
V
V
IN
REF
REF
REF
REF
REF
IN
DD
= 0 or V
= 6 V rms @ 1 kHz
A, V
A = 20 V p-p Sine Wave @ 10 kHz
B = 0 V See Figure 6.
B = 20 V p-p Sine Wave @ 10 kHz
A = 0 V See Figure 6.
= 5%
REF
B = 20 V p-p Sine Wave
DD
IL
IL
DD
or V
or V
or V
IH
IH
DD
DD
to 0 V
REV. A