The DAC1280 is a very low distortion digital-to-analog converter (DAC) suited for performance testing of seismic equipment

DAC1280

Manufacturer Part NumberDAC1280
DescriptionThe DAC1280 is a very low distortion digital-to-analog converter (DAC) suited for performance testing of seismic equipment
ManufacturerTexas Instruments
DAC1280 datasheet
 


Specifications of DAC1280

Dac: Channels1InterfaceBitstream
Output TypeCurrentSettling Time(µs)100
Reference: TypeExtPower Consumption(typ)(mw)18
Pin/package16TSSOP  
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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

DAC1280 Summary of contents

  • Page 1

    ... 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° ...

  • Page 2

    ... JB , using a procedure described in JESD51-2a (sections 6 and 7). Product Folder Link(s): DAC1280 www.ti.com MAX UNIT +5.5 V +0.3 V +3.6 V +100 mA +10 mA AVDD + 0.3 V DVDD + 0.3 V +150 °C +125 °C +150 °C DAC1280 TSSOP UNITS 16 PINS 111.9 33.3 52.4 °C/W 2.0 51.2 — Copyright © 2010, Texas Instruments Incorporated ...

  • Page 3

    ... Power-down 30k nominal W REF REF /R ratio over the range of 40% to 105% of nominal. REF Product Folder Link(s): DAC1280 DAC1280 SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010 DAC1280 MIN TYP MAX UNIT ±1250 ● Gain mA – 0. 0.15 ±0.02 ±0.25 ±0.1 ±0.5 4 ppm/°C ± ...

  • Page 4

    ... IN 25 –2.6 AVSS + 4.75 1.65 Gain = 1/1 Power-down Operating (9) Power-down Gain = 1/1 Power-down –40 –40 –40 , and R : 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 ...

  • Page 5

    ... Copyright © 2010, Texas Instruments Incorporated t CLK t TCSU TDATA Sample t CTHD t STDAT Figure 1. MIN Product Folder Link(s): DAC1280 DAC1280 SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010 t TDATA Next TDATA Sample t TSOP Output Update TYP MAX UNIT 240 1000 ns 100 ns 30 ...

  • 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

    ... Product Folder Link(s): DAC1280 DAC1280 SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010 = +5V, and R = 30kΩ, unless REF REF OUTPUT SPECTRUM Gain = 1/2 4k FFT V = 0.5dBFS, 31.25Hz - OUT THD = 128.9dB - SNR = 119.5dB 100 150 200 250 300 350 400 450 500 Frequency (Hz) Figure 3 ...

  • Page 8

    ... Units Gain = 1 105 125 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. ...

  • Page 9

    ... G = 1/32 105 100 0.1 100 1k (1) 125 1/4 100 -100 Product Folder Link(s): DAC1280 DAC1280 SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010 = +5V, and R = 30kΩ, unless REF REF SNR vs TEMPERATURE 105 125 -15 Temperature ( C) ° ...

  • Page 10

    ... 1/32 115 G = 1/64 110 105 100 4.5 5.0 5.2 2.5 ANALOG POWER-SUPPLY CURRENT -55 -35 Product Folder Link(s): DAC1280 www.ti.com = +5V, and R = 30kΩ, unless REF REF SNR vs CLK CLK/2 , 0.5dBFS - 1/64 1.5 2.0 2.5 3.0 3.5 4.0 4.5 CLK (MHz) Figure 21. ...

  • Page 11

    ... The DAC1280 is a high-accuracy digital-to-analog converter (DAC) that provides outstanding THD performance together with low noise. The DAC1280 is suitable for the demanding requirements of energy exploration and precision instrumentation where a low-distortion test signal is needed. Figure 26 shows the DAC1280 block diagram. The DAC provides a signal output proportional density input ...

  • Page 12

    ... COM Figure 28. I/V Converter Output Voltage 12 Submit Documentation Feedback Output Scaling The full-scale output of the DAC1280 is set by the reference voltage and an external reference resistor. The GAIN[2:0] control pins select one of seven output digital ranges. In operation, the reference voltage and reference resistor are usually fixed, and the DAC output range is selected by the gain pins ...

  • Page 13

    ... Output current and REF REF voltage are differential. Excludes the effects of DAC1280 offset, gain and linearity errors, errors in reference voltage, errors as a result of external resistors, and errors from the external current-to-voltage conversion. Refer to ...

  • Page 14

    ... TDATA 1s density 25%/75 5V, R REF are differential. Excludes the effects of DAC1280 offset, gain and linearity errors, errors in reference voltage, errors caused by external resistors, and errors as a result of external current-to-voltage conversion. See 14 Submit Documentation Feedback TDATA bits are '1'), the differential output current positive maximum value ...

  • Page 15

    ... Power Consumption The total power consumption is the power consumed by the DAC1280 plus that current-to-voltage converter. 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 ...

  • Page 16

    ... OPA211) is essential in order to achieve rated performance. Settling Time The settling time of the DAC1280 resulting from a step input change consists of the DAC1280 settling time and the I/V filter settling time. Other filter components used in the DAC signal path may also add to the settling time ...

  • Page 17

    ... Seismic System Figure 34 illustrates an example of a three-channel seismic measurement system that consists of the DAC1280 and three ADS1282s. The DAC1280 drives the ADS1282s and the geophone sensors for testing. The DAC signal can be routed through the ADS1282 input mux to the Switch Network ...

  • Page 18

    ... DAC1280 SBAS432A – APRIL 2010 – REVISED SEPTEMBER 2010 Basic Connection Figure 35 shows a basic connection of the DAC1280, with an external op amp current-to-voltage converter. Bipolar analog supplies are Single-supply operation (+5V) is also possible by grounding AVSS; for single-supply operation, bias the current-to-voltage converter noninverting terminals to midsupply ...

  • 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 12.0 Q1 ...

  • 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 ...

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  • 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’ ...