LTC1657 LINER [Linear Technology], LTC1657 Datasheet

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LTC1657

Manufacturer Part Number
LTC1657
Description
Parallel 16-Bit Rail-to-Rail Micropower DAC
Manufacturer
LINER [Linear Technology]
Datasheet

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FEATURES
APPLICATIO S
BLOCK DIAGRA
MICROPROCESSOR
MICROPROCESSOR
SYSTEM RESET
DECODE LOGIC
DATA IN FROM
16-Bit Monotonic Over Temperature
Deglitched Rail-to-Rail Voltage Output: 8nV•s
5V Single Supply Operation
I
Maximum DNL Error: 1LSB
Settling Time: 20 s to 1LSB
Internal or External Reference
Internal Power-On Reset to Zero Volts
Asynchronous CLR Pin
Output Buffer Configurable for Gain of 1 or 2
Parallel 16-Bit or 2-Byte Double Buffered Interface
Narrow 28-Lead SSOP Package
Multiplying Capability
Instrumentation
Digital Calibration
Industrial Process Control
Automatic Test Equipment
Communication Test Equipment
CC
DATA BUS
: 650 A Typ
FROM
FROM
19
18
17
16
15
14
13
12
11
10
28
27
9
8
7
6
5
4
3
1
2
D15 (MSB)
CSLSB
LDAC
CLR
D8
D7
D0 (LSB)
CSMSB
WR
U
W
REGISTER
REGISTER
INPUT
INPUT
8-BIT
8-BIT
MSB
LSB
POWER-ON
RESET
REGISTER
16-BIT
DAC
REFERENCE
2.048V
16-BIT
DAC
GND
23
REFOUT
20
22
REFHI
REFLO
21
DESCRIPTIO
The LTC
voltage output, 16-bit digital-to-analog converter (DAC) in
a 28-pin SSOP or PDIP package. It includes a rail-to-rail
output buffer amplifier, an internal 2.048V reference and
a double buffered parallel digital interface.
The LTC1657 operates from a 4.5V to 5.5V supply. It has
a separate reference input pin that can be driven by an
external reference. The full-scale output can be 1 or 2
times the reference voltage depending on how the X1/X2
pin is connected.
The LTC1657 is similar to Linear Technology Corporation’s
LTC1450 12-bit V
path. It is the only buffered 16-bit parallel DAC in a 28-lead
SSOP package and includes an onboard reference for
stand alone performance.
, LTC and LT are registered trademarks of Linear Technology Corporation.
R
X1/X2
26
+
Parallel 16-Bit Rail-to-Rail
V
5V
CC
R
24
®
1657 is a complete single supply, rail-to-rail
V
1657 TA01
OUT
25
OUT
0V TO
4.096V
Micropower DAC
U
DAC family allowing an upgrade
–1.0
–0.2
–0.4
–0.6
–0.8
1.0
0.8
0.6
0.4
0.2
0.0
0
Differential Nonlinearity
16384
vs Input Code
DIGITAL INPUT CODE
LTC1657
32768
49152
1657 G01
1
65535

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LTC1657 Summary of contents

Page 1

... SSOP or PDIP package. It includes a rail-to-rail output buffer amplifier, an internal 2.048V reference and a double buffered parallel digital interface. The LTC1657 operates from a 4.5V to 5.5V supply. It has a separate reference input pin that can be driven by an external reference. The full-scale output can times the reference voltage depending on how the X1/X2 pin is connected ...

Page 2

... X1/X2 ....................................................... – 0. REFOUT ............................ – 0. OUT Operating Temperature Range LTC1657C ............................................. LTC1657I ........................................ – Maximum Junction Temperature .......................... 125 C Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T REFLO tied to GND, X1/X2 tied to GND, unless otherwise noted. ...

Page 3

... Measured 100 A OUT REFOUT Shorted to GND (Note 6) See Applications Information X1/X2 Tied to V OUT X1/X2 Tied to GND Note 4: Digital inputs Note 5: DAC switched between all 1s and all 0s. Note 6: Guaranteed by design. Not subject to test. LTC1657 MIN TYP MAX UNITS 0.3 0 ...

Page 4

... LTC1657 W U TYPICAL PERFOR A CE CHARACTERISTICS Differential Nonlinearity 1.0 0.8 0.6 0.4 0.2 0.0 –0.2 –0.4 –0.6 –0.8 –1.0 0 16384 32768 49152 65535 DIGITAL INPUT CODE 1657 G01 Minimum Output Voltage vs Output Sink Current 1.2 CODE ALL 0’S V 1LSB OUT 1.0 125 C 0.8 0 0.4 – OUTPUT SINK CURRENT (mA) ...

Page 5

... LDAC (Pin 28): Load DAC (Asynchronous Active Low). Used to asynchronously transfer the contents of the input registers to the DAC register which updates the output voltage. If held low, the DAC register loads data from the input registers which will immediately update V LTC1657 CC , OUT . OUT ...

Page 6

... LTC1657 U DIGITAL INTERFACE TRUTH TABLE CLR CSMSB CSLSB TIMING DIAGRAM CSLSB CSMSB t CWS WR LDAC DATA 6 WR LDAC FUNCTION X X Clears input and DAC registers to zero ...

Page 7

... Least Significant Bit (LSB): One LSB is the ideal voltage difference between two successive codes. n LSB = (V – V )/(2 – Nominal LSBs: LTC1657 LSB = 4.096V/65535 = 62.5 V DAC Transfer Characteristic: REFHI REFLO – • CODE OUT 65536 for X1/X2 connected to V OUT ...

Page 8

... CLR pin function). Reference The LTC1657 includes an internal 2.048V reference, giv- ing the LTC1657 a full-scale range of 4.096V in the gain- of-2 configuration. The onboard reference in the LTC1657 is not internally connected to the DAC’s reference resistor string but is provided on an adjacent pin for flexibility. ...

Page 9

... Offset and linearity are defined and tested over the region of the DAC transfer function where no output limiting can occur OUTPUT REF CC VOLTAGE 0 32768 65535 INPUT CODE (a) LTC1657 / and the DAC full-scale CC REF CC as shown in Figure 1c. No full-scale limiting CC is less than (V – FSE)/2. REF ...

Page 10

... This circuit shows a digitally programmable current source from an external voltage source using an external op amp, an LT1218 and an NPN transistor (2N3440). Any digital word from 0 to 65535 is loaded into the LTC1657 and its output correspondingly swings from 0V to 4.096V. This voltage will be forced across the resistor R ...

Page 11

... MIN 0.125 0.005 0.100 (3.175) (2.54) MIN (0.127) BSC MIN LTC1657 0.386 – 0.393* (9.804 – 9.982) (0.838 1615 0.150 – 0.157** (3.810 – 3.988 ...

Page 12

... V CC DATA (0:15) 2 CSLSB 3 CSMSB P LTC1657 LDAC 27 CLR X1/X2 REFLO GND shown in the configuration, the output of LTC1657 is amplified by 8 for an output swing 32.768V convenient 0.5mV/LSB. A Higher Voltage Output DAC 5V 36V OUT 6 LT1218 2 – ...

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