ltc2632-lz8 Linear Technology Corporation, ltc2632-lz8 Datasheet

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ltc2632-lz8

Manufacturer Part Number
ltc2632-lz8
Description
Manufacturer
Linear Technology Corporation
Datasheet
FEATURES
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APPLICATIONS
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BLOCK DIAGRAM
Integrated Precision Reference
2.5V Full-Scale 10ppm/°C (LTC2632-L)
4.096V Full-Scale 10ppm/°C (LTC2632-H)
Maximum INL Error: ±1LSB (LTC2632A-12)
Low Noise: 0.75mV
Guaranteed Monotonic –40°C to 125°C Automotive
Temperature Range
Selectable Internal or External Reference
2.7V to 5.5V Supply Range (LTC2632-L)
Low Power Operation 0.4mA at 3V
Power-On-Reset to Zero-Scale/Mid-Scale
Double-Buffered Data Latches
8-Lead ThinSOT™ Package
Mobile Communications
Process Control and Industrial Automation
Automatic Test Equipment
Portable Equipment
Automotive
GND
V
V
CS/LD
SCK
CC
OUTA
DAC A
P-P
CONTROL
LOGIC
0.1Hz to 200kHz
32-BIT SHIFT REGISTER
REFERENCE
INTERNAL
DECODE
SWITCH
DAC B
DESCRIPTION
The LTC
output DACs with an integrated, high-accuracy, low-drift
reference in an 8-lead TSOT-23 package. It has rail-to-rail
output buffers and is guaranteed monotonic.
The LTC2632-L has a full-scale output of 2.5V, and operates
from a single 2.7V to 5.5V supply. The LTC2632-H has a
full-scale output of 4.096V, and operates from a 4.5V to
5.5V supply. Each DAC can also operate with an external
reference, which sets the full-scale output to the external
reference voltage.
These DACs communicate via a simple SPI/MICROWIRE
compatible 3-wire serial interface which operates at clock
rates up to 50MHz. The LTC2632 incorporates a power-on
reset circuit. Options are available for reset to zero-scale
or reset to mid-scale in internal reference mode, or reset
to mid-scale in external reference mode after power-up.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5396245, 5859606, 6891433, and 6937178.
POWER-ON
V
REF
RESET
V
OUTB
REF
SDI
®
2632 BD
2632 is a family of dual 12-, 10-, and 8-bit voltage-
10ppm/°C Reference
Dual 12-/10-/8-Bit SPI
–1
–2
Integral Nonlinearity (LTC2632A-LZ12)
2
1
0
V
0
V
INTERNAL REF .
CC
OUT
= 3V
1024
DACs with
CODE
2048
LTC2632
3072
2632 TA01
4095
2632fa
1

Related parts for ltc2632-lz8

ltc2632-lz8 Summary of contents

Page 1

... TSOT-23 package. It has rail-to-rail output buffers and is guaranteed monotonic. The LTC2632-L has a full-scale output of 2.5V, and operates from a single 2.7V to 5.5V supply. The LTC2632-H has a full-scale output of 4.096V, and operates from a 4.5V to 5.5V supply. Each DAC can also operate with an external reference, which sets the full-scale output to the external reference voltage ...

Page 2

... Min (V OUTA OUTB REF ..................................–0.3V to Min (V Operating Temperature Range LTC2632C ................................................ 0°C to 70°C LTC2632H (Note 3) ............................ –40°C to 125°C Maximum Junction Temperature .......................... 150°C Storage Temperature Range .................. –65°C to 150°C Lead Temperature (Soldering, 10 sec) ................... 300°C ORDER INFORMATION LTC2632 A C TS8 – ...

Page 3

... LTFSH 2.5V • (4095/4096) LTC2632-LX10 LTFSP 2.5V • (1023/1024) LTC2632-LX8 LTFSV 2.5V • (255/256) LTC2632-LZ12 LTFSG 2.5V • (4095/4096) LTC2632-LZ10 LTFSN 2.5V • (1023/1024) LTC2632-LZ8 LTFST 2.5V • (255/256) LTC2632-HI12 LTFSM 4.096V • (4095/4096) LTC2632-HI10 LTFSS 4.096V • (1023/1024) LTC2632-HI8 LTFSY 4.096V • (255/256) LTC2632-HZ12 LTFSK 4.096V • (4095/4096) ...

Page 4

... LTC2632 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T LTC2632-LI12/-LI10/-LI8/-LX12/-LX10/-LX8/-LZ12/-LZ10/-LZ8, LTC2632A-LI12/-LX12/-LZ12 (V SYMBOL PARAMETER CONDITIONS DC Performance Resolution Monotonicity V = 3V, Internal Ref. CC (Note 4) DNL Differential V = 3V, Internal Ref. CC Nonlinearity (Note 4) INL Integral V = 3V, Internal Ref. ...

Page 5

... ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T LTC2632-LI12/-LI10/-LI8/-LX12/-LX10/-LX8/-LZ12/-LZ10/-LZ8, LTC2632A-LI12/-LX12/-LZ12 (V SYMBOL PARAMETER Reference Input Input Voltage Range Resistance Capacitance I Reference Current, Power-Down Mode REF Reference Output Output Voltage Reference Temperature Coefficient ...

Page 6

... LTC2632 TIMING CHARACTERISTICS range, otherwise specifications are at T LTC2632-LI12/-LI10/-LI8/-LX12/-LX10/-LX8/-LZ12/-LZ10/-LZ8, LTC2632A-LI12/-LX12/-LZ12 (V SYMBOL PARAMETER t SDI Valid to SCK Setup 1 t SDI Valid to SCK Hold 2 t SCK High Time 3 t SCK Low Time 4 t CS/LD Pulse Width ...

Page 7

... ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T LTC2632-HI12/-HI10/-HI8/-HZ12/-HZ10/-HZ8, LTC2632A-HI12/-HZ12 (V SYMBOL PARAMETER CONDITIONS DC Performance Resolution Monotonicity V = 5V, Internal Ref. (Note 4) CC DNL Differential V = 5V, Internal Ref. (Note 4) CC Nonlinearity INL Integral V = 5V, Internal Ref. (Note 4) ...

Page 8

... LTC2632 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T LTC2632-HI12/-HI10/-HI8/-HZ12/-HZ10/-HZ8, LTC2632A-HI12/-HZ12 (V SYMBOL PARAMETER Reference Input Input Voltage Range Resistance Capacitance I Reference Current, Power-Down Mode REF Reference Output Output Voltage Reference Temperature Coefficient Output Impedance Capacitive Load Driving ...

Page 9

... For V = 4.096V and and linearity is defined from code 16 to code 4,095. Note 5: Inferred from measurement at code 16 (LTC2632-12), code 4 (LTC2632-10) or code 1 (LTC2632-8), and at full-scale. The denotes the specifications which apply over the full operating temperature l = 25° ...

Page 10

... LTC2632 TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C, unless otherwise noted. LTC2632-L12 (Internal Reference Integral Nonlinearity (INL) 1 0.5 0 –0.5 –1.0 0 1024 2048 CODE INL vs Temperature 1 0.5 INL (POS) 0 –0.5 INL (NEG) –1.0 –50 – 100 125 TEMPERATURE (°C) 2632 G03 Settling to ± ...

Page 11

... TYPICAL PERFORMANCE CHARACTERISTICS T = 25°C, unless otherwise noted. LTC2632-H12 (Internal Reference Integral Nonlinearity (INL) 1 0.5 0 –0.5 –1.0 0 1024 2048 CODE INL vs Temperature 1 INL (POS) 0.5 0 INL (NEG) –0.5 –1.0 –50 – 100 125 TEMPERATURE (°C) 2632 G10 Settling to ± ...

Page 12

... 2.5V FS INTERNAL REF 0.25 0 –0.25 –0. 128 CODE LTC2632 Load Regulation (LTC2632- (LTC2632- (LTC2632- –2 –4 –6 INTERNAL REFERENCE –8 CODE = MID-SCALE –10 –30 –20 – (mA) OUT 2632 G19 12 Differential Nonlinearity (DNL) 1 ...

Page 13

... Large-Signal Response V OUT 0.5V/DIV 1/4 SCALE to 3/4 SCALE 2µs/DIV 2632 G22 Headroom at Rails vs Output Current 5.0 5V SOURCING 4.5 4.0 3.5 3V (LTC2632-L) SOURCING 3.0 2.5 2.0 1.5 1.0 3V (LTC2632-L) SINKING 0 (mA) OUT Power-On Reset to Mid-Scale V CC 2V/DIV V OUT 0.5V/DIV 200µs/DIV Mid-Scale Glitch Impulse CS/LD 5V/DIV LTC2632-H12 ...

Page 14

... REFERENCE VOLTAGE (V) DAC to DAC Crosstalk (Dynamic) CS/LD 5V/DIV 1 DAC SWITCH 0-FS 2V/DIV V OUT 2mV/DIV LTC2632-H12, V 6.7nV-s TYP 2µs/DIV 14 Noise Voltage vs Frequency 500 V CODE = MID-SCALE INTERNAL REFERENCE 400 300 200 100 0 100k 1M 100 2632 G29 0.1Hz to 10Hz Voltage Noise ...

Page 15

... Supply Voltage Input. 2.7V ≤ (LTC2632-L) or 4.5V ≤ V ≤ 5.5V (LTC2632-H). Bypass CC to GND with a 0.1µF capacitor. SDI (Pin 8): Serial Interface Data Input. Data on SDI is clocked into the DAC on the rising edge of SCK. The LTC2632 accepts input word lengths of either bits. LTC2632 ≤ 5.5V CC 2632fa 15 ...

Page 16

... LTC2632 BLOCK DIAGRAM GND OUTA DAC A CS/LD SCK TIMING DIAGRAM SCK SDI CS/LD 16 INTERNAL REFERENCE CONTROL DECODE LOGIC 32-BIT SHIFT REGISTER Figure 1. Serial Interface Timing REF SWITCH V REF V OUTB DAC B SDI POWER-ON RESET 2632 ...

Page 17

... OPERATION The LTC2632 is a family of dual voltage output DACs in an 8-lead TSOT package. Each DAC can operate rail-to-rail using an external reference, or with its full-scale voltage set by an integrated reference. Fifteen combinations of accuracy (12-, 10-, and 8-bit), power-on reset value (zero- scale, mid-scale in internal reference mode, or mid-scale in external reference mode), and full-scale voltage (2 ...

Page 18

... DAC address, A3-A0; and finally the 16-bit data word. The data word comprises the 12-, 10- or 8-bit input code, ordered MSB-to-LSB, followed don’t-care bits (LTC2632-12, LTC2632-10 and LTC2632-8 respectively; see Figure 2). Data can only be transferred to the device when the CS/LD signal is low, beginning on the first rising edge of SCK ...

Page 19

... LTC2632-LX. The reference mode of LTC2632-HZ/LTC2632-LZ/LTC2632- HI/LTC2632-LI (internal reference power-on default), can be changed by software command after power-up. The same is true for the LTC2632-LX (external reference power-on default). Power-Down Mode For power-constrained applications, power-down mode can be used to reduce the supply current whenever less than two DAC outputs are needed ...

Page 20

... The resistance from the LTC2632 GND pin to the ground plane should be as low as possible. Resistance here will add directly to the effective DC output impedance of the device (typically 0.1Ω ...

Page 21

... OPERATION LTC2632 2632fa 21 ...

Page 22

... LTC2632 OPERATION OUTPUT VOLTAGE 0V NEGATIVE INPUT CODE OFFSET (b) Figure 4. Effects of Rail-to-Rail Operation On a DAC Transfer Curve (Shown for 12 Bits) (a) Overall Transfer Function (b) Effect of Negative Offset for Codes Near Zero (c) Effect of Positive Full-Scale Error for Codes Near Full-Scale PACKAGE DESCRIPTION 0.40 MAX 3 ...

Page 23

... Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC2632 PAGE NUMBER 17, 19, ...

Page 24

... LTC2632 TYPICAL APPLICATION LTC2632 DACs Adjust LTC2755-16 Offset, Amplified with LT1991 PGA to ±5V 5V 15V V DD LTC2755 0.1µF R OFSA 0.1µF 0.1µF R IN1 + 1/2 LT1469 R COM1 – 0.1µF 30pF –15V R EFA DAC D DAC C RELATED PARTS PART NUMBER DESCRIPTION LTC1662 Dual 10-Bit Ultralow Power V with External Reference ...

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