DAC1280IPWR

Manufacturer Part NumberDAC1280IPWR
DescriptionDAC SEISMIC MONITOR 16-TSSOP
ManufacturerTexas Instruments
TypeDAC
DAC1280IPWR datasheet
 


Specifications of DAC1280IPWR

Voltage Supply SourceAnalog and Digital, Dual ±Voltage - Supply±2.5V, 5V, 1.8 V ~ 3.3 V
Operating Temperature-40°C ~ 125°CMounting TypeSurface Mount
Package / Case16-TSSOPLead Free Status / RoHS StatusLead free / RoHS Compliant
Data Interface-Sampling Rate (per Second)-
Resolution (bits)-Other names296-27869-2
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Page 1/24

Download datasheet (634Kb)Embed
Next
www.ti.com
Low Distortion Digital-to-Analog Converter for Seismic Monitoring
FEATURES
1
Outstanding Performance:
2
– THD: –125dB
– SNR: 120dB (413Hz BW, Gain = 1/1)
– Gain Error: 0.1%
Pin Operation: No Registers to Program
Gain: 1/1 to 1/64
SYNC Input for Phase Control
Power-Down Mode
Low Power: 18mW
Analog Supply: +5V or ±2.5V
Digital Supply: 1.8V to 3.3V
Small 16-Pin TSSOP Package
Temperature Range: –40°C to +85°C
APPLICATIONS
Energy Exploration Equipment
Seismic Monitoring Systems
PWDN
SYNC
CLK
Bitstream
Source
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Check for Samples:
DAC1280
DESCRIPTION
The DAC1280 is a very low distortion digital-to-analog
converter (DAC) suited for performance testing of
seismic
equipment.
high-accuracy output signal from a bitstream input.
The device achieves very high linearity in a small
package while dissipating only 18mW. Together with
the
high-performance
analog-to-digital converters (ADCs), these devices
create a test and measurement system that meets
the exacting demands of energy exploration and
seismic monitoring equipment.
The DAC1280 is designed to match the system
components (power supply, clock and reference
voltage) of the companion ADCs, the ADS1281 and
ADS1282. The input to the DAC1280 is a 1s density
modulated bitstream. The DAC1280 output is a
differential current intended for use with an active I/V
converter. The I/V converter provides a voltage output
suitable for performance testing of sensors and
ADCs.
Three gain control pins set the output range in 6dB
steps from 0dB to –36db (±2.5V to ±0.039V
differential). The attenuation ranges match the gains
of the ADS1282 for testing at all gains. The DAC
uses a reference voltage and bias resistor to set the
full-scale output. The resistor can be adjusted to
fine-trim the DAC full-scale.
The SYNC pin aligns the input data sampling to the
CLK phase. A power-down pin shuts down the device
when not in use. The DAC1280 is available in a
small, 16-pin TSSOP package and is fully specified
for operation over –40°C to +85°C temperature range
with a maximum operating temperature of +125°C.
DVDD
VREF
AVDD
Current Output
Synchronization
Differential DAC
3
DAC1280
DGND
GAIN[2:0]
AVSS
DAC1280
SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010
The
DAC1280
provides
ADS1281
and
ADS1282
External I/V Converter
V
OUT
Copyright © 2010, Texas Instruments Incorporated
a

DAC1280IPWR Summary of contents

  • Page 1

    ... DVDD VREF AVDD Current Output Synchronization Differential DAC 3 DAC1280 DGND GAIN[2:0] AVSS DAC1280 SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010 The DAC1280 provides ADS1281 and ADS1282 External I/V Converter V OUT Copyright © 2010, Texas Instruments Incorporated a ...

  • Page 2

    ... DAC1280 SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications ...

  • Page 3

    ... THD = Total harmonic distortion; measured by ADS1282 with complementing gain including first nine harmonics, DAC output = –0.5dBFS, 31.25Hz. (7) SNR = Signal-to-noise ratio; measured by ADS1282 with complementing gain over 413Hz bandwidth, DAC output = –0.5dBFS, 31.25Hz. Copyright © 2010, Texas Instruments Incorporated = 30kΩ, unless otherwise noted. Refer to circuit configuration shown in REF TEST CONDITIONS ...

  • Page 4

    ... REF REF or V levels Product Folder Link(s): DAC1280 www.ti.com DAC1280 TYP MAX UNIT 30 60 kΩ DVDD V 0.2 × DVDD V 0 4.096 MHz f /16 MHz CLK AVSS + 5.25 V 3.6 V 3.6 3 150 +85 °C +125 °C +150 °C Copyright © 2010, Texas Instruments Incorporated ...

  • Page 5

    ... TCSU t CLK rising edge to TDATA hold time CTHD t SYNC low pulse width SYLW t Rising CLK after SYNC high to TDATA sample time STDAT t TDATA sample to output update TSOP t TDATA period TDATA Copyright © 2010, Texas Instruments Incorporated t CLK t TCSU TDATA Sample t CTHD ...

  • Page 6

    ... Negative analog power supply, V Positive analog power supply — No connection; do not connect externally. Negative signal output current Positive signal output current Power-down control; active low Product Folder Link(s): DAC1280 www.ti.com DESCRIPTION common, R common REF REF Copyright © 2010, Texas Instruments Incorporated ...

  • Page 7

    ... Frequency (Hz) Figure 6. Copyright © 2010, Texas Instruments Incorporated TYPICAL CHARACTERISTICS Figure 35. THD and SNR measured by ADS1282 (1ms sampling and complement gain setting 0.5dBFS, 31.25Hz - 100 ...

  • Page 8

    ... Product Folder Link(s): DAC1280 www.ti.com = +5V, and R = 30kΩ, unless REF REF GAIN MATCH HISTOGRAM ° ° Absolute Gain Match (ppm) Figure 9. GAIN ERROR HISTOGRAM Gain Error (ppm) Figure 11. OFFSET HISTOGRAM Offset (ppm, FS) Figure 13. Copyright © 2010, Texas Instruments Incorporated ...

  • Page 9

    ... 1/8 140 - -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 Output Amplitude (dB) (1) THD measurement noise limited for amplitudes less than –10dB. Figure 18. Copyright © 2010, Texas Instruments Incorporated Figure 35. THD and SNR measured by ADS1282 (1ms 125 1/32 120 G = 1/64 115 110 ...

  • Page 10

    ... CLK (MHz) Figure 21. SNR vs V REF 1/64 3.0 3.5 4.0 4.5 5.0 5.2 Reference Voltage (V) Figure 23. TEMPERATURE 105 125 -15 Temperature ( C) ° Figure 25. Copyright © 2010, Texas Instruments Incorporated ...

  • Page 11

    ... TDATA Reset CLK/16 4-bit CLK Counter DGND Copyright © 2010, Texas Instruments Incorporated DAC1280 OVERVIEW The current-steering stage switches the tap current to either output, IOUTP or IOUTN result of the sampling of TDATA. A higher 1s density directs more current toward Conversely, a higher density of 0s directs more current to IOUTN than to IOUTP ...

  • Page 12

    ... Equation 1: V (TDATA - REF Current = 7.5 Gain · · · 25% R REF = 5V (nominal) = 30kΩ (nominal) V REF R ratio from the nominal REF = 5V and R = 30kΩ. See the REF REF for the adjustment range. Table 1 Copyright © 2010, Texas Instruments Incorporated is 50%) (1) ...

  • Page 13

    ... DAC1280 loads VREF with 220kΩ. The 220kΩ resistor disconnects in power-down mode. +5V +V Reference 0.1 F -2.5V (1) Recommended noise capacitor. Copyright © 2010, Texas Instruments Incorporated IOUTP – IOUTN (mA) –1250 ● Gain –625 ● Gain 0 +625 ● Gain +1250 ● Gain Figure 27 ...

  • Page 14

    ... Output current and voltage REF Figure Product Folder Link(s): DAC1280 www.ti.com Table 1. (1) V – ±1250 ±2.5 ±625 ±1.25 ±312 ±0.625 ±156 ±0.312 ±78.1 ±0.156 ±39.1 ±0.0781 ±19.5 ±0.0391 27. Copyright © 2010, Texas Instruments Incorporated ...

  • Page 15

    ... The power consumption of the DAC1280, in turn, depends on the gain setting. Table 3 summarizes the DAC1280 consumption. Copyright © 2010, Texas Instruments Incorporated Table 3. DAC1280 Power Consumption GAIN 1/16 1/32 1/64 pins draw Offset and Gain Error The DAC1280 features low offset error (±50ppmFS, typical) and low gain error (± ...

  • Page 16

    ... Product Folder Link(s): DAC1280 www.ti.com 35. LARGE-SIGNAL STEP RESPONSE V OUT Input Step Time (50 s/div) m (Noise Removed for Clarity) /160 (25.6kHz with CLK Figure 33 illustrates the DAC1280 OUTPUT FREQUENCY RESPONSE CLK = 4.096MHz Excludes I/V Filter Rolloff Output Frequency (kHz) Copyright © 2010, Texas Instruments Incorporated 50 ...

  • Page 17

    ... Switch Network Geophone Figure 34. Three-Channel Seismic System Block Diagram Copyright © 2010, Texas Instruments Incorporated SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010 geophone or routed through an external switch network. The DAC input signal is sourced from a bitstream pattern stored in the device flash memory (as shown here), or supplied directly from a bitstream modulator implemented in an FPGA ...

  • Page 18

    ... Figure 35. Basic Connection Product Folder Link(s): DAC1280 www.ti.com and implement A B and R scale the A B current-to-voltage converter circuit close to the DAC1280 using 1nF C0G/Film +2.5V 50W V OPA211 N -2.5V +2.5V 50W V OPA211 P -2.5V 1nF C0G/Film 2kW ( Copyright © 2010, Texas Instruments Incorporated the a ...

  • Page 19

    ... Orderable Device (1) Package Type Package Status DAC1280IPW ACTIVE TSSOP DAC1280IPWR ACTIVE TSSOP (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. ...

  • Page 20

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing DAC1280IPWR TSSOP PW PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 16 2000 330.0 12.4 6.9 Pack Materials-Page 1 1-Oct-2010 Pin1 (mm) (mm) (mm) (mm) Quadrant 5.6 1.6 8.0 12 ...

  • Page 21

    ... Device Package Type DAC1280IPWR TSSOP PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm 2000 Pack Materials-Page 2 1-Oct-2010 Width (mm) Height (mm) 346.0 346.0 29.0 ...

  • Page 22

    ...

  • Page 23

    ...

  • Page 24

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...