LTC2615 Linear Technology Corporation, LTC2615 Datasheet

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LTC2615

Manufacturer Part Number
LTC2615
Description
Ltc2615 - Octal 14-bit Rail-to-rail Dacs In 16-lead Ssop
Manufacturer
Linear Technology Corporation
Datasheet

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FEATURES
APPLICATIO S
BLOCK DIAGRA
Smallest Pin-Compatible Octal DACs:
LTC2605: 16 Bits
LTC2615: 14 Bits
LTC2625: 12 Bits
Guaranteed Monotonic Over Temperature
400kHz I
Wide 2.7V to 5.5V Supply Range
Low Power Operation: 250µA per DAC at 3V
Individual Channel Power-Down to 1µA, Max
Ultralow Crosstalk Between DACs (<10µV)
High Rail-to-Rail Output Drive (±15mA, Min)
Double-Buffered Digital Inputs
27 Selectable Addresses
LTC2605/LTC2615/LTC2625: Power-On Reset to
Zero Scale
LTC2605-1/LTC2615-1/LTC2625-1: Power-On Reset
to Midscale
Tiny 16-Lead Narrow SSOP Package
Mobile Communications
Process Control and Industrial Automation
Instrumentation
Automatic Test Equipment
V
V
V
V
OUT A
OUT B
OUT C
OUT D
GND
REF
CA2
SCL
1
2
3
4
5
6
7
8
2
C Interface
DAC A
DAC B
DAC C
DAC D
U
W
32-BIT SHIFT REGISTER
2-WIRE INTERFACE
Rail-to-Rail DACs in 16-Lead SSOP
DAC H
DAC G
DAC F
DAC E
DESCRIPTIO
The LTC
and 12-bit, 2.7V to 5.5V rail-to-rail voltage-output DACs in
16-lead narrow SSOP packages. They have built-in
high performance output buffers and are guaranteed
monotonic.
These parts establish new board-density benchmarks
for 16- and 14-bit DACs and advance performance
standards for output drive, crosstalk and load regulation
in single-supply, voltage-output multiples.
The parts use the 2-wire I
The LTC2605/LTC2615/LTC2625 operate in both the
standard mode (maximum clock rate of 100kHz) and the
fast mode (maximum clock rate of 400kHz).
The LTC2605/LTC2615/LTC2625 incorporate a power-on
reset circuit. During power-up, the voltage outputs rise
less than 10mV above zero scale; and after power-up, they
stay at zero scale until a valid write and update take place.
The power-on reset circuit resets the LTC2605-1/
LTC2615-1/LTC2625-1 to midscale. The voltage output
stays at midscale until a valid write and update
takes place.
All other trademarks are the property of their respective owners.
2605/15/25 BD
, LTC and LT are registered trademarks of Linear Technology Corporation.
11
10
16
15
14
13
12
9
V
V
V
V
V
CA0
CA1
SDA
LTC2605/LTC2615/LTC2625
CC
OUT H
OUT G
OUT F
OUT E
®
2605/LTC2615/LTC2625 are octal 16-, 14-
Octal 16-/14-/12-Bit
U
Differential Nonlinearity (LTC2605)
–0.2
–0.4
–0.6
–0.8
–1.0
1.0
0.8
0.6
0.4
0.2
0
0
V
V
2
CC
REF
C compatible serial interface.
= 5V
= 4.096V
16384
32768
CODE
49152
2605 G02
65535
1
2605f

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LTC2615 Summary of contents

Page 1

... The power-on reset circuit resets the LTC2605-1/ LTC2615-1/LTC2625-1 to midscale. The voltage output stays at midscale until a valid write and update takes place. ...

Page 2

... Gain Temperature Coefficient (Note 1) Operating Temperature Range LTC2605C/LTC2615C/LTC2625C ............. 0°C to 70°C LTC2605C-1/LTC2615C-1/LTC2625C-1 ... 0°C to 70°C LTC2605I/LTC2615I/LTC2625I ............ – 40°C to 85°C LTC2605I-1/LTC2615I-1/LTC2625I-1 .. – 40°C to 85° ORDER PART NUMBER LTC2605CGN LTC2605CGN OUT H ...

Page 3

... IN C I/O Pin Capacitance IN C Capacitance Load for Each Bus Line B C External Capacitive Load on CAn Address Pins CA0, CA1 and CA2 LTC2605/LTC2615/LTC2625 ● The denotes specifications which apply over the full operating = 25°C. REF = 4.096V (V = 5V), REF = 2.048V ( CONDITIONS ±10 5V, Midscale ...

Page 4

... L Note 3: SDA, SCL CA0, CA1 and CA2 floating. CC Note 4: Inferred from measurement at code 256 (LTC2605/LTC2605-1), code 64 (LTC2615/LTC2615-1) or code 16 (LTC2625/LTC2625-1) and at full scale. Note 5V 4.096V. DAC is stepped 1/4 scale to 3/4 scale CC REF and 3/4 scale to 1/4 scale. Load is 2kΩ ...

Page 5

... CC 0 4.096V REF 0.6 0.4 DNL (POS) 0.2 0 –0.2 DNL (NEG) –0.4 –0.6 –0.8 –1.0 –50 –30 – TEMPERATURE (°C) 2605 G04 LTC2605/LTC2615/LTC2625 2605/15/25 EC01 Differential Nonlinearity (DNL 4.096V REF 0.6 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 16384 32768 49152 CODE INL vs V ...

Page 6

... OUT 100µV/DIV 9TH CLOCK OF 3RD DATA SCL BYTE 2V/DIV 2µs/DIV 4.096V CC REF 1/4-SCALE TO 3/4-SCALE STEP 200pF L L AVERAGE OF 2048 EVENTS LTC2615 Integral Nonlinearity (INL 4.096V REF –2 –4 –6 –8 0 4096 8192 ...

Page 7

... TEMPERATURE (°C) 2605 G18 Gain Error 0.4 0.3 0.2 0.1 0 –0.1 –0.2 –0.3 –0.4 2.5 3 3 (V) CC 2605 G21 LTC2605/LTC2615/LTC2625 Load Regulation 1.0 CODE = MIDSCALE 0.8 0.6 0.4 0 REF CC –0.2 –0 REF CC –0.6 –0.8 –1.0 –35 –25 –15 – ...

Page 8

... LTC2605/LTC2615/LTC2625 W U TYPICAL PERFOR A CE CHARACTERISTICS LTC2605/LTC2615/LTC2625 Midscale Glitch Impulse TRANSITION FROM MS OUT 10mV/DIV TRANSITION FROM MS TO MS-1 9TH CLOCK OF 3RD DATA SCL BYTE 2V/DIV 2605 G24 2.5µs/DIV Power-On Reset to Midscale REF CC 1V/DIV OUT 2605 G27 500µs/DIV Output Voltage Noise, 0 ...

Page 9

... SCL t HD(STA) S ALL VOLTAGE LEVELS REFER TO V LTC2605/LTC2615/LTC2625 SDA (Pin 9): Serial Data Bidirectional Pin. Data is shifted into the SDA pin and acknowledged by the SDA pin. This is a high impedance pin while data is shifted in open- . REF drain N-channel output during acknowledgment. This pin ≤ ...

Page 10

... C bus operating in the fast mode, an active pull-up will be necessary if the bus capacitance is greater than 200pF. The LTC2605/LTC2615/LTC2625 are receive-only (slave) devices. The master can write to the LTC2605/LTC2615/ LTC2625. The LTC2605/LTC2615/LTC2625 do not respond to a read from the master. The START (S) and STOP (P) Conditions When the bus is not in use, both SCL and SDA must be high ...

Page 11

... CA0, CA1 and CA2 and the global address are shown in Table 2. In addition to the address selected by the address pins, the parts also respond to a global address. This address allows a common write to all LTC2605, LTC2615 and LTC2625 parts to be accomplished with one 3-byte write transaction 2 on the I C bus ...

Page 12

... LTC2605/LTC2615/LTC2625 U OPERATIO The command (C3-C0) and address (A3-A0) assignments are shown in Table 1. The first four commands in the table consist of write and update operations. A write operation loads the 16-bit data word from the 32-bit shift register into the input register of the selected DAC update operation copies the data word from the input register to the DAC register ...

Page 13

... Resistance here will add directly to the effective DC output impedance of the device (typically 0.020Ω), and will degrade DC crosstalk. Note that the LTC2605/LTC2615/LTC2625 are no more susceptible to these effects than other parts of their type; on the contrary, they allow layout-based performance improvements to shine rather than limiting attainable performance with excessive internal resistance ...

Page 14

... LTC2605/LTC2615/LTC2625 U OPERATIO 14 2605f ...

Page 15

... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC2605/LTC2615/LTC2625 REF ...

Page 16

... LTC2605/LTC2615/LTC2625 U TYPICAL APPLICATIO Demonstration Circuit—LTC2428 20-Bit ADC Measures Key Performance Parameters ADDRESS SELECTION 10k 10k BUS LT1236ACS8 OUT 1 5V GND 2 4.096V JP2 0.1µF V REF U5 LT1461ACS8 OUT 3 1 SHDN ...

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