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AD7399BRZ

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
AD7398/AD7399
Rev. C | Page 19 of 24
PROGRAMMABLE DAC REFERENCE VOLTAGE
With the flexibility of the AD7398/AD7399, one of the internal
DACs can be used to control a common programmable V
REFX
for the remainder of the DACs.
The circuit configuration is shown in Figure 37. The relationship of
V
REFX
to V
REF
is dependent upon the digital code and the ratio of
R1 and R2, and is given by
1
2
21
2
1
R
RD
V
R
R
VV
N
REFXREFREFX
××−
+×=
(4)
×+
+×
=
1
2
2
1
1
2
1
R
R
N
D
R
R
V
V
REF
REFX
(5)
where:
D = decimal equivalent of input code.
N = number of bits.
V
REF
= applied external reference.
V
REFX
= reference voltage for DAC A to DAC D.
Table 7. V
REFX
vs. R1 and R2
R1, R2 Digital Code V
REFX
R1 = R2 0000 0000 0000 2 V
REF
R1 = R2 1000 0000 0000 1.3 V
REF
R1 = R2 1111 1111 1111 V
REF
R1 = 3R2 0000 0000 0000 4 V
REF
R1 = 3R2 1000 0000 0000 1.6 V
REF
R1 = 3R2 1111 1111 1111 V
REF
The accuracy of V
REFX
is affected by the quality of R1 and R2.
Therefore, tight tolerance, low tempco, thin film resistors
should be used.
02179-037
AD7398/AD7399
DAC A
V
REF
A
V
OUT
A
R1 ±0.1%
R2 ±0.1%
V
REF
VIN
DAC B
V
REF
B
V
OUT
B
ADR293
DAC C
V
REF
C
V
OUT
C
DAC D
V
REF
D
V
OUT
D
TO OTHER
COMPONENTS
Figure 37. Programmable DAC Reference
AD7398/AD7399
Rev. C | Page 20 of 24
OUTLINE DIMENSIONS
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
COMPLIANT TO JEDEC STANDARDS MS-013-AA
10.50 (0.4134)
10.10 (0.3976)
0.30 (0.0118)
0.10 (0.0039)
2.65 (0.1043)
2.35 (0.0925)
10.65 (0.4193)
10.00 (0.3937)
7.60 (0.2992)
7.40 (0.2913)
0.75 (0.0295)
0.25 (0.0098)
45°
1.27 (0.0500)
0.40 (0.0157)
COPLANARITY
0.10
0.33 (0.0130)
0.20 (0.0079)
0.51 (0.0201)
0.31 (0.0122)
SEATING
PLANE
8°
0°
16
9
8
1
1.27 (0.0500)
BSC
03-27-2007-B
Figure 38. 16-Lead Standard Small Outline Package [SOIC_W]
Wide Body
(RW-16)
Dimensions shown in millimeters and (inches)
16
9
81
PIN 1
SEATING
PLANE
8°
0°
4.50
4.40
4.30
6.40
BSC
5.10
5.00
4.90
0.65
BSC
0.15
0.05
1.20
MAX
0.20
0.09
0.75
0.60
0.45
0.30
0.19
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-153-AB
Figure 39. 16-Lead Thin Shrink Small Outline Package [TSSOP]
(RU-16)
Dimensions shown in millimeters
AD7398/AD7399
Rev. C | Page 21 of 24
ORDERING GUIDE
Model
1, 2
Resolution (Bits) Temperature Range Package Description Package Option Ordering Quantity
AD7398BR 12 −40°C to +125°C 16-Lead SOIC_W RW-16 47
AD7398BR-REEL 12 −40°C to +125°C 16-Lead SOIC_W RW-16 1,000
AD7398BRZ 12 −40°C to +125°C 16-Lead SOIC_W RW-16 47
AD7398BRZ-REEL 12 −40°C to +125°C 16-Lead SOIC_W RW-16 1,000
AD7398BRU 12 −40°C to +125°C 16-Lead TSSOP RU-16 96
AD7398BRU-REEL7 12 −40°C to +125°C 16-Lead TSSOP RU-16 1,000
AD7398BRUZ 12 −40°C to +125°C 16-Lead TSSOP RU-16 96
AD7398BRUZ-REEL7 12 −40°C to +125°C 16-Lead TSSOP RU-16 1,000
AD7398WBRUZ-RL7 12 −40°C to +125°C 16-Lead TSSOP RU-16 1,000
AD7399BR 10 −40°C to +125°C 16-Lead SOIC_W RW-16 47
AD7399BR-REEL 10 −40°C to +125°C 16-Lead SOIC_W RW-16 1,000
AD7399BRZ 10 −40°C to +125°C 16-Lead SOIC_W RW-16 47
AD7399BRZ-REEL 10 −40°C to +125°C 16-Lead SOIC_W RW-16 1,000
AD7399BRU 10 −40°C to +125°C 16-Lead TSSOP RU-16 96
AD7399BRU-REEL7 10 −40°C to +125°C 16-Lead TSSOP RU-16 1,000
AD7399BRUZ 10 −40°C to +125°C 16-Lead TSSOP RU-16 96
AD7399BRUZ-REEL7 10 −40°C to +125°C 16-Lead TSSOP RU-16 1,000
1
Z = RoHS Compliant Part.
2
W = Qualified for Automotive Applications.
The AD7398 contains 3254 transistors. The die size measures 108 mils × 144 mils.
AUTOMOTIVE PRODUCTS
The AD7398WBRUZ-RL7 model is available with controlled manufacturing to support the quality and reliability requirements of
automotive applications. Note that this automotive model may have specifications that differ from the commercial models; therefore,
designers should review the Specifications section of this data sheet carefully. Only the automotive grade product shown is available for
use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and
to obtain the specific Automotive Reliability reports for this model.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

AD7399BRZ

Mfr. #:
Buy AD7399BRZ
Manufacturer:
Analog Devices Inc.
Description:
Digital to Analog Converters - DAC Quad Serial-Input 10-Bit
Lifecycle:
New from this manufacturer.
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