LTC2755 Linear Technology, LTC2755 Datasheet

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LTC2755

Manufacturer Part Number
LTC2755
Description
Quad Current Output 12-/14-/16-Bit SoftSpan DACs
Manufacturer
Linear Technology
Datasheet

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www.DataSheet4U.com
V
V
FEATURES
APPLICATIONS
TYPICAL APPLICATION
OUTD
OUTA
Program or Pin-Strap Six Output Ranges
Maximum 16-Bit INL Error: ±1 LSB over Temperature
Low 1μA (Maximum) Supply Current
Guaranteed Monotonic over Temperature
Low Glitch Impulse 1nV•s
2.7V to 5.5V Single Supply Operation
2μs Settling Time to ±1 LSB
Parallel Interface with Readback of All Registers
Asynchronous CLR Pin Clears DAC Outputs to 0V in
Any Output Range
Power-On Reset to 0V
64-Pin 9mm × 9mm QFN Package
High Resolution Offset and Gain Adjustment
Process Control and Industrial Automation
Automatic Test Equipment
Data Acquisition Systems
Unipolar: 0V to 5V, 0V to 10V
Bipolar: ±5V, ±10V, ±2.5V, –2.5V to 7.5V
SPAN I/O
DATA I/O
+
+
Quad 16-Bit V
I
I
I
I
R
R
OUT2A
OUT1A
OUT1D
OUT2D
VOSA
R
R
VOSD
FBA
FBD
V
REF1
5V
R
OFSA
V
OUT
REF2
5V
DAC A
I/O PORT
I/O PORT
DAC D
DAC with Software-Selectable Ranges
R
IN1
R
OFSD
R
REFD
COM1
LTC2755-16
+
REFC
REFA REFB
+
R
COM2
DAC B
DAC C
R
R
OFSB
IN2
R
OFSC
2755 TA01
R
I
I
R
V
R
I
I
R
OUT2B
OUT1B
OUT1C
OUT2C
VOSB
VOSC
FBB
DD
FBC
DESCRIPTION
The LTC
multiplying parallel-input, current-output DACs. These
DACs operate from a single 2.7V to 5.5V supply and are all
guaranteed monotonic over temperature. The LTC2755A-16
provides 16-bit performance (±1LSB INL and DNL) over
temperature without any adjustments. These SoftSpan™
DACs offer six output ranges—two unipolar and four
bipolar—that can be programmed through the parallel
interface, or pinstrapped for operation in a single range.
The LTC2755 DACs use a bidirectional input/output paral-
lel interface that allows readback of any internal register,
including the DAC output span settings. A power-on reset
circuit resets the DAC outputs to 0V when power is initially
applied. A logic low on the CLR pin asynchronously clears
the DACs to 0V in any output range.
The parts are specifi ed over commercial and industrial
temperature ranges.
SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 7034735,
7256721.
+
+
, LT , LTC and LTM are registered trademarks of Linear Technology Corporation.
0.1μF
5V
®
12-/14-/16-Bit SoftSpan
2755 is a family of quad 12-, 14-, and 16-bit
DACs with Parallel I/O
V
V
Quad Current Output
OUTB
OUTC
Part Number
SoftSpan Parallel I
LTC2755-16 Integral Nonlinearity (INL)
–1.0
–0.2
–0.4
–0.6
–0.8
1.0
0.8
0.6
0.4
0.2
0.0
0
V
V
±10V RANGE
DD
REF
= 5V
= 5V
SINGLE
LTC2751
16384
OUT
32768
CODE
DAC Selector Guide
DUAL
LTC2753 LTC2755
LTC2755
49152
25°C
90°C
–45°C
2755 TA01b
QUAD
65535
1
2755f

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LTC2755 Summary of contents

Page 1

... DACs offer six output ranges—two unipolar and four bipolar—that can be programmed through the parallel interface, or pinstrapped for operation in a single range. The LTC2755 DACs use a bidirectional input/output paral- lel interface that allows readback of any internal register, including the DAC output span settings. A power-on reset circuit resets the DAC outputs to 0V when power is initially applied ...

Page 2

... For more information on tape and reel specifi cations, go to: 2 (Notes 1, 2) Operating Temperature Range LTC2755C ..................................................... 0°C to 70°C to GND ..................±15V LTC2755I .................................................. –40°C to 85°C Maximum Junction Temperature........................... 125°C Storage Temperature Range ................... –65°C to 150°C +0.3V (max 7V ...

Page 3

... REF code = Full Scale, –3dB Range ±10V, 10kHz REF Sine Wave (Note 8) (Note 9) Multiplying (Note 10 OUT1 LTC2755 denotes the ● = 25°C. A LTC2755B-16 LTC2755A-16 MAX MIN TYP MAX MIN TYP ±1 ±1 ±0.2 ±1 ±2 ±0.4 ± ...

Page 4

... LTC2755 www.DataSheet4U.com ELECTRICAL CHARACTERISTICS specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Power Supply V Supply Voltage DD I Supply Current Digital Inputs V Digital Input High Voltage IH V Digital Input Low Voltage ...

Page 5

... CONDITIONS C = 10pF L (Note 11) No Update No Update (Note 11) (Note 11) (Note 11) No Data Shoot-Through (Note 11) (Note 11 10pF L (Note 11 10pF L (Note 11) No Update No Update LTC2755 MIN TYP MAX UNITS ● ● ● ● ● ● ● ...

Page 6

... COM2 Note 5: Using LT1469 with C = 15pF . A ±0.0015% settling time FEEDBACK of 1.7μs can be achieved by optimizing the time constant on an individual basis. See Application Note 74, Component and Measurement Advances Ensure 16-Bit DAC Settling Time. TYPICAL PERFORMANCE CHARACTERISTICS LTC2755-16 Integral Nonlinearity (INL) 1 0.8 V ...

Page 7

... G05 +INL –INL (V) REF 2755 G08 +INL –INL 4 4.5 5 5.5 V (V) DD 2755 G09b LTC2755 T = 25°C, unless otherwise noted. A Gain Error vs Temperature REF 12 ±10V RANGE 8 0.6ppm/°C (TYP –4 –8 –12 –16 –40 –20 ...

Page 8

... LTC2755-12 Integral Nonlinearity (INL REF ±10V RANGE 0.6 0.4 0.2 0.0 –0.2 –0.4 –0.6 –0.8 –1.0 0 1024 LTC2755-12, LTC2755-14, LTC2755-16 Supply Current vs Logic Input Voltage DIGITAL INPUT VOLTAGE (V) 8 Differential Nonlinearity (DNL) 1.0 0.8 0.6 0.4 ...

Page 9

... D5-D13 (Pins 4-12): LTC2755-14 Only. DAC Input/Output Data Bits. These I/O pins set and read back the DAC code. D13 is the MSB. D7-D15 (Pins 4-12): LTC2755-16 Only. DAC Input/Output Data Bits. These I/O pins set and read back the DAC code. D15 is the MSB. GND (Pin 13): Shield Ground, provides necessary shielding for I ...

Page 10

... REF2 Typically 5V; accepts up to ±15V. MSPAN (Pin 33): Manual Span Control Pin. MSPAN is used to confi gure the LTC2755 for operation in a single, fi xed 10 output range. When confi gured for single-span operation, the output range is set via hardware pin strapping. The span I/O port’ ...

Page 11

... RIN1 to RCOM1. For normal operation tie RIN1 to the external reference voltage VREF1 (see Typical Applica- tions). Typically 5V; accepts up to ±15V. Exposed Pad (Pin 65): Ground. The Exposed Pad must be soldered to the PCB. LTC2755 to ground. VOSB to ground. VOSA fl ows through the feedback resistor OUT1A (Pin 64) ...

Page 12

... LTC2755 www.DataSheet4U.com BLOCK DIAGRAM LTC2755-16 DATA I/O 4-12, 36-42 PORT SPAN I/O 1, 52, 47 PORT A2 16 DAC A1 17 ADDRESS DATA INPUT DATA DAC REGISTER REGISTER SPAN INPUT 3 SPAN DAC 3 REGISTER REGISTER 16 16 DATA INPUT DATA DAC REGISTER REGISTER SPAN INPUT ...

Page 13

... Write, Update and Clear Timing VALID VALID VALID Readback Timing VALID VALID VALID LTC2755 VALID t 25 2753 TD01 VALID 2753 TD02 2755f 13 ...

Page 14

... V DD LTC2755- DAC A MSPAN S2 S1 DAC B S0 D/S DAC C DAC D 16 DATA I/O WR UPD READ DAC ADDRESS Figure 1. Using MSPAN to Confi gure the LTC2755 for Single-Span Operation (±10V Range). – ±10V + – ±10V + – ±10V + – ±10V + 2755 F01 2755f ...

Page 15

... DACs power up in the manually-chosen range at the appropriate code. Manual Span Confi guration Multiple output ranges are not needed in some applications. To confi gure the LTC2755 for single-span operation, tie the and the D/S pin to GND. The desired MSPAN pin output range is then specifi ...

Page 16

... Table 3. Address Codes VOSX Codes not shown are reserved and should not be used. *If readback is taken using the ALL DACs address, the LTC2755 defaults to DAC A. DAC CHANNEL DAC A DAC B DAC C DAC D ALL DACs* 2755f ...

Page 17

... OV V OUTX 010 8000 H 011 C000 H = 2.5V) using readback to check the contents of the input OUT HI-Z 8000 H 8000 0000 H INPUT REGISTER DAC REGISTER LTC2755 UPDATE (±5V RANGE 0V) OUT 0V (8000 IN ±5V RANGE) H 2755 TD03 4000 H UPDATE (5V) UPDATE (–5V) +5V –5V 2755 TD04 H UPDATE (2.5V) +2.5V ...

Page 18

... A (V/V) A1 • VOL1 A VOL1 V (mV) 0 OS2 I (mV (V/V) 0 VOL2 Table 6. Partial List of LTC Precision Amplifi ers Recommended for Use with the LTC2755 with Relevant Specifi cations AMPLIFIER μV nA LT1001 25 2 LT1097 50 0.35 LT1112 (Dual) 60 0.25 LT1124 (Dual ...

Page 19

... DAC settling time and op amp selection. Precision Voltage Reference Considerations Much in the same way selecting an operational amplifi er for use with the LTC2755 is critical to the performance of the system, selecting a precision voltage reference also requires due diligence. The output voltage of the LTC2755 is directly affected by the voltage reference ...

Page 20

... INL and DNL) of the LTC2755-16. Layout must be tied OUT2X Figures and 6 show the layout for the LTC2755 evaluation board, DC1112. This shows how to route the digital signals around the device without interfering with the reference and output op amps. Complete demo board documentation is available in the DC1112 quick start guide ...

Page 21

... APPLICATIONS INFORMATION Figure 3. LTC2755 Evaluation Board DC1112. Layer 1, Top Layer. Figure 4. LTC2755 Evaluation Board DC1112. Layer 2, GND Plane. LTC2755 2755 F03 2755 F04 2755f 21 ...

Page 22

... LTC2755 www.DataSheet4U.com TYPICAL APPLICATIONS Figure 5. LTC2755 Evaluation Board DC1112. Layer 3, Power Traces. Figure 6. LTC2755 Evaluation Board DC1112. Layer 4, Bottom Layer. 22 2755 F05 2755 F06 2755f ...

Page 23

... Plastic QFN (9mm × 9mm) (Reference LTC DWG # 05-08-1705 Rev C) 0.70 ±0.05 7.50 REF 8.10 ±0.05 9.50 ±0.05 (4 SIDES) PACKAGE OUTLINE 0.25 ±0.05 0.50 BSC 0.75 ± 0. 0.10 TYP 7.50 REF (4-SIDES) 0.200 REF 0.00 – 0.05 LTC2755 R = 0.115 TYP 63 64 PIN 1 CHAMFER C = 0.35 7.15 ± 0.10 7.15 ± 0.10 (UP64) QFN 0406 REV C 0.25 ± 0.05 0.50 BSC BOTTOM VIEW—EXPOSED PAD 23 0.40 ± 0.10 ...

Page 24

... REFB DD IN1 COM1 4 D15 5 D14 6 D13 7 D12 8 D11 9 D10 DATA I LTC2755- SPAN I DAC 17 A1 ADDRESS 18 A0 D/S WR CLR MSPAN READ UPD GND ...

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