If'
.~
W
Complete,
LowPower
12-BitD/A Converter
ANAL'OG
DEVICES
AD370/AD371!
[
FEATURES
Bipolar Voltage Output: A0370
Unipolar Voltage Output: A0371
Low Power: 150mW max
Linearity: f:1/2LSB, -55°C to +125°C (S Version)
TTL/CMOS Compatible
Compatible with Standard 18-Pin OAC Configurations
Hermetic 18-Pin DIP ("0" Package)
Factory Trimmed Gain and Offset: No External Adjustments
Required
Monotonicity Guaranteed Over Specified Temperature Range
OBS
PRODUCT DESCRIPTION
AO370/AO371
FUNCTIONAL
OLE
BLOCK DIAGRAM
IS-PIN DIP
PRODUCT HIGHLIGHTS
The AD370/AD371 is a complete 12-bit digital-to-analog converter fabricated with the most advanced monolithic and hybrid technologies. The design incorporates a low power monolithic CMOS DAC, precision high speed FET-input operational
amplifiers and a low drift reference available in a hermetically
sealed package. This innovative design results in significant
performance advantages over conventional designs. The integral package-substrate combined with a lower chip count improves reliability over the standard low power hybrids of
this type.
The converters come in two versions: AD370 with a bipolar
output voltage range (-tOV to +10V) and AD371 with a unipolar output voltage range (0 to +10V). Each device is internally laser trimmed for gain and offset to provide adjustmentfree operation with only f:0.05% absolute error. The FET input
operational amplifiers optimize the speed vs. power trade-off
by settling to I/2LSB from a full scale transition in 3511swith
maximum total power dissipation of only 150mW. The low
power monolithic CMOS DAC employs a current-switched
silicon-chromium R-2R ladder to ensure that mono tonicity is
maintained over the full temperatUre range.
The AD370/AD371 "K" and "S" features :!:I/2LSB maximum
linearity error. Its rated temperatUre ranges are 0 to +70° C
for the "J" and "K" versions and -55° C to + 12 5° C for the "S"
versIOn.
~
~-
1. The AD370/AD371 replaces other devices of this type with
significant increases in performance.
TE
2. Reduced power consumption requirements (150mW max)
result in improved stability and shorter wann-up time.
3. The precision output amplifiers and CMOS DAC have been
optimized to settle within 1/2LSB for a full scale transition
in 3511s.
4. Reduced chip count and integral package-subsrate
prove reliability.
5. System performance
im-
upgrading is possible without redesign.
6. Internally laser trimmed-no gain or offset adjustments
required for specified accuracy.
are
7. The device is available in a hermetically-sealed ceramic 18
lead dual-in-line package. Processing to MIL-STD-883 Class
B is available.
.
8. The AD370/AD371 is a second-source
DACs of the same configuration.
for 18-pin 12-bit
IJ
".- 1.\111 1\11'\ IIUI'"
(typical at TA
= +25°C,Vs = :t15 Voltsunlessotherwisenoted)
AD370K
'
Model
AD370j
RANGE
-10£0+10
CODE
OCBI
.
:tI
:tl
:t1/2
:t1/2
LINEARITY ERROR
+25°C
T miD - T max
ABSOLUTE ACCURACY
+25°C
T miD
OFFSET ERROR
+25°C
INTERNAL
DIGITAL
AD371K
AD370S1
Volts
:tl
:tl
:tI/2
:tl/2
:t1/2
:tl/2
:t1/2
:tl/2
LSB2 max
LSB2 max
:to. 3
:to.3
% of FSR3 max
% of FSR3 max
mV max
TIME
REFERENCE
25(35 max)
~
+10.0
Volts
2.0
0.8
Volts min
Volts max
INPUTS
VINH
VINL
OBS
INPUT LEAKAGE
CURRENT
INPUT CAPACITANCE
POWER SUPPLY
REJECTION
:t1.0
/lA
8
pI"
0.01
0.01
% FSR3 /% Vs max
% FSR3/% Vs max
RATIO
+ 15V Supply
-15V Supply
POWER SUPPLY
Units
CBI
:t1
:t5
AD371S1
O£O+l0
:to.05
:to.2
- T max
FULL SCALE SETTLING
TO :t1/2LSB
AD371j
CURRENTS
3.5( 5 max)
2.5(4 max)
+ 15V Supply
-15V Supply
OLE
POWER DISSIPATION
105( 150 max)
TEMPERATURE
0 £0 -t-70
RANGE
NOTES
I Also available to MIL-STD~83. Level B.
'LSB, Least Significant Bit
J FSR, Full Scale Range
.Specifications same as AD370).
"Specifications same as AD371).
.. .Specifications same as AD370S.
Specifications subject to change without notice.
mA max
mA max
.
VOL. I, 10.12 DIGITAL-TO-ANALOG CONVERTERS
-55 £0 +125
rnW
"C
TE
[
I.
ABSOLUTE MAXIMUM RATINGS
(TA = +2SoC unless otherwise noted)
VDD(toGND)
VEE(toGND)
Digital Input Voltage Range.
StOrage Temperature
CAUTION - ELECTROSTATIC
+17V
17V
. . . . . . . . . . . . . Voo to GND
:-65°Cto+150°C
9
10
SENSITIVE DEVICES
OBS
MSB
Figure 3. Burn-In Circuit
BIT 2
BIT 11
BITJ
BIT 10
BIT 4
BIT 9
AO370/AO371
BIT 8
BIT 6
BIT 7
GAIN
TRIM
OUTPUT
Table 1. Code Table for the AD371 (CBI)
DIGITAL
INPUT
11111111111]
100000000001
-15V
+15V
.
1000,00000000
011111111111
000000000000
ADJ70 - OFFSET TRIM
ADJ71 - TEST POINT
0
4.9975 Volts
5.0000 Volts
9.9975 Volts
OLE
BIT 5
GND
NOMINAL ANALOG OUTPUT
1111111111]1
100000000000
011111111111
000000000000
LSB
12
11
DIGITAL INPUT
NOMINAL ANALOG OUTPUT
TE
-10.000 Volts
-0.0097 Volt
-0.0048
0
Volt
9.9952 Volts
Table 2. Code Table for the AD370 (OCBI)
Figure 1. Pin Designations
+1SV
SUPPL Y
9
AD371
-15V
AD370/AD371
The digital control inputs are zener protected; however permanent damage may occur on unconnected units under high
energy electrostatic fields. Keep unused units in conductive
foam at all times.
AO370/
+15V
0.01pF
POWER' SUPPL Y
COMMAND
11
0.01pF
-15V
SUPPL Y
10
Figure 2. Power Supply Decoupling
D
Accuracy error ot a O/A converter is defined as the difference
between the analog outPut that is expected when a given digital code is applied and the output that is actually measured
with that code applied to the converter. Accuracy error can
be caused by gain error, zero error or linearity error. The initial accuracy of the AD370/AD371 is trimmed to within
0.05% of full scale by laser trimming the gain and zero ~rrors.
Of the error specifications, the linearity error specification is
the most important since it cannot be corrected by the user.
The linearity error of the AD3 70/ AD3 71 is specified over its
entire temperature range. This means that the analog output
will not vary by more than :1:1I2LSB maximum from an ideal
straight line drawn between the end points (inputs all "Is"
and all "Os") over the specified operating temperature range
of 0 to +70°C for the "K" version and -55°C to +125°C for
the "S" version.
+15V
+15V
10Mi1
20ki1
5Mi1
PIN 8
20ki1
~
PIN 7
~
!
!
-15V
-15V
OFFSET
GAIN TRIM
TRIM
(AD370 ONLY)
Figure 4. Optional External Trims
SETTLING TIME
Settling time for the AD370/AD371 is the total time required
for the output to settle within :!:l/2LSB band around its final
value after a change in input (including slew time). The settling
time specification is given for a full scale step which is 20V for
the AD370 and 10V for the AD371.
The absolute accuracy of the AD370/AD371 has been guaranteed to :1:0.05%of full scale by internal factory trim of the
gain and offset. External gain and offset adjustment terminals
have been made available to allow fine adjustment to the
:1:0.012% accuracy level. The measurement system used to
calibrate the output should be capable of stable resolution of
1/4LSB in the regions of zero and full scale. The adjustment
procedure, described below, should be carefully followed to
assure optimum converter performance.
OBS
IMPROVED SECOND SOURCE
The substrate design of the AD 370/ AD3 71 provides for complete pin-for-pin compatibility with other 18-pin DACs,;
Hybrid Systems Corp. DACHO, DAC350 series and Micro
Networks Corp, MN360, MN370, MN3200 series 18-pin 12-bit
digital-to-analog converters all share the same pin configuration
except for pin 7 and pin 8 (see Table 3). The AD370/AD371
is a superior direct replacement for these devices where the
function of pins 7 and 8 allow. The versatility designed into
the AD370/AD371 allows the function of pin 7 and pin 8 to be
configured to exactly second source each of the other units.
Information on other second source devices with 4 quadrant
multiplying capability is available from Analog Devices,
OLE
The proper connections for the offset and gain adjustments are
shown in Figure 4. For the AD371 full-scale calibration apply
a digital input of all "Is" and adjust the gain potentiometer
to +9.9975 volts (see Table 1).
The offset adjustment of the AD3 70 is made at the half-scale
code. Adjust the offset potentiometer until O.OOOVis obtained
on the output. The full-scale adjustment is made at the negative endpoint or a code of all "Is", Adjust the gain potentiometer until-10.000
volts is obtained on the output.
Analog Devices
AD370KD
AD37fKD
AD370SD
AD370SD/883B
AD371SD
AD371SD/883B
TE
Hybrid Systems
DAC346C-12BPG
DACH6C-12UP
DACH7LPC-12G
DACH7LPS-12G
DACH7LPC-12U
DACH 7LPB-12U
DAC356LPC-12
DAC356LPB-12
DAC356C-12
DAC356B-12
Micro Networks
MN360
MN370
MN362
MN371
MN360H
MN370H
MN362H
MN371H
Table 3. Cross Reference
AD370/AD371
Model
Package
AD370JN
AD370JD
AD371JN
AD371JD
AD370KN
AD370KD
AD371KN
AD371KD
AD370S0
A03 70S0/883 B
AD371S0
AD371S0/883B
Polymer Seal
Hennetic
Polymer Seal
Hennetic
Polymer Seal
Hennetic
Polymer Seal
Hennetic
Hermetic
Hennetic
Hennetic
Hennetic
Package
Stylel
HYI8A
HYI8A
HYI8A
HYI8A
HYI8A
HYI8A
HYI8A
HY18A
HY18A
HY18A
HY18A
HY18A
1S<eS<crion 20 for pa.:kag<oouin< infonTIation.
VOL. I, 10-14 DIGITAL. TO-ANALOG CONVERTERS
ORDERING GUIDE
Linearity
ILSB
lLSB
lLSB
ILSB
1/2LSB
1/2LSB
1/2LSB
l/2LSB
1/2LSB
1/2LSB
I/2LSB
I/2LSB
Output Voltage
Range
-IOV to + IOV
-laY to +IOV
0 to +IOV
OtO+IOV
-IOVto+IOV
-IOV to + IOV
0 to +IOV
OtO+IOV
-laY to +IOV
-lOVto+IOV
0 to +IOV
0 to +IOV
Operating Temperature
Range
0 to +70°C
0 to +70oC
0 to +70oC
0 to +70oC
0 to +70oC
0 to +70°C
Oto+70°C
OtO+70oC
-ssoC to +12SoC
-SsoC to +12SoC
-SsoC to +12SoC
-SsoC to +12Soc
MN3211
MN321O
is-PIN PACKAGES
(Continued)
HYISA
IS-Pin Hybrid Package
~::: :]
==J
t
11I
J:I
~.
Lb
OBS
n
~OL
E
~'27'
~
0 lOSe""
g.g~
BASE"
~
:'
,,;;;;;
~L
- - - - - - -
035;0
]
.
JL
~~~~iJ~~
9
0.030
10'6"MAX
1
---r
~
,
021515'6"
t
,,'
~
'-1'
\
I
Q..~lLillJ
0.0551139"
&g~:g=: &m:~:~~:
TE
20-PIN PACKAGES
D20A
2O-PinCeramic DIP Package
0208
20-Pin Ceramic DIP Package
,0.4301,0.,611
gmEE:r:::
:I~]~
L-
0990125.15)~
65)
."'r"D'
,,~~mmrom
00151038)
--11-0.02010.51)
-
~ ~ I ~~ ~ ~I ~
~.!-j
14451
~
~lg:~1
"1
100070.010
oT:
~"
~ ~ -I
f-°018
J
.0002
l~
1046 .OOSI
0501127)
TVP
..
- 0900 .0.005
12286 .0.131
TOl NON ACCUM
0.095
0.300 .0.010
17.62 .0.251
-A~'
~
0.012to.30)
--I
~
--11--0010
0.300 17.62)
VOL. 1,20-8 PACKAGE INFORMA TlON
]l~
12540 70251
I"
0.085
-I
004011011
0.05411.37)
0.01210.3051
.
~Q,~I\
0310"6'41 ~
~~~~~
(025~~~n
Dimensions
shown
Lead No.1
Identified
in inches
and (mm).
by Dot or Notch.
TVP
T
0.'00
.0231
."..
.0005
1254.0.13)