Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsData collecting ICsData acquisition IC - ADC 16 Bit VQFN 32

FEATURES DESCRIPTION

APPLICATIONS

CH A+

CHA-

Output

Interface

Circuit

Oscillator

20MHz

Out EN

Clock

Select

Divider

REFIN A

Reference

Voltage

2.5V

REFOUT

OUTA

OUT B

OUT C

OUT D

CLKIN

AGND BGND

CLKOUT

CLKSEL

CHB+

CHB-

REFINB

CHC+

CHC-

REFINC

2nd-Order

DS Modulator

CHD+

CHD-

REFIND

2nd-Order

DS Modulator

2nd-Order

DS Modulator

2nd-Order

DS Modulator

ADS1204

www.ti.com

........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009

Four 1-Bit, 10MHz, 2nd-Order

Delta-Sigma Modulators

• 16-Bit Resolution

The ADS1204 is a four-channel, high-performance

device, with four delta-sigma ( Δ Σ ) modulators with

• 14-Bit Linearity

100dB dynamic range, operating from a single +5V

• Resolution/Speed Trade-Off: 10-Bit Effective

supply. The differential inputs are ideal for direct

Resolution with 10 µ s Signal Delay (12-Bit with

connection to transducers in an industrial

19 µ s)

environment. With the appropriate digital filter and

• ± 2.5V Input Range at 2.5V

modulator rate, the device can be used to achieve

16-bit analog-to-digital (A/D) conversion with no

• Internal Reference Voltage: 2%

missing code. Effective resolution of 12 bits can be

• Gain Error: 0.5%

obtained with a digital filter data rate of 160kHz at a

• Four Independent Delta-Sigma Modulators

modulator rate of 10MHz. The ADS1204 is designed

for use in medium- to high-resolution measurement

• Four Input Reference Buffers

applications including current measurements, smart

• Onboard 20MHz Oscillator

transmitters, industrial process control, weight scales,

• Selectable Internal or External Clock

chromatography, and portable instrumentation. It is

available in a QFN-32 (5 × 5) package.

• Operating Temperature Range:

– 40 ° C to +105 ° C

• QFN-32 (5 × 5) Package

• Motor Control

• Current Measurement

• Industrial Process Control

• Instrumentation

• Smart Transmitters

• Portable Instruments

• Weight Scales

• Pressure Transducers

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.

2 All trademarks are the property of their respective owners.

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.

Summary of content (28 pages)

PAGE 1
ADS1204 www.ti.com........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 Four 1-Bit, 10MHz, 2nd-Order Delta-Sigma Modulators FEATURES 1 • 16-Bit Resolution • 14-Bit Linearity • Resolution/Speed Trade-Off: 10-Bit Effective Resolution with 10µs Signal Delay (12-Bit with 19µs) • ±2.5V Input Range at 2.5V • Internal Reference Voltage: 2% • Gain Error: 0.
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ADS1204 SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009........................................................................................................................................... www.ti.com 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.
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ADS1204 www.ti.com........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 DISSIPATION RATINGS (1) PACKAGE TA ≤ +25°C POWER RATING DERATING FACTOR ABOVE TA = +25°C (1) TA = +70°C POWER RATING TA = +85°C POWER RATING TA = +105°C POWER RATING QFN-32 (5×5) 3406mW 27.
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ADS1204 SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009........................................................................................................................................... www.ti.com ELECTRICAL CHARACTERISTICS (continued) Over recommended operating free-air temperature range at –40°C to +105°C, AVDD = 5V, BVDD = 3V, CH x+ = 0.5V to 4.5V, CH x– = 2.5V, REFIN = REFOUT = internal +2.5V, CLKIN = 20MHz, and 16-bit Sinc3 filter with decimation by 256, unless otherwise noted.
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ADS1204 www.ti.com........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 ELECTRICAL CHARACTERISTICS (continued) Over recommended operating free-air temperature range at –40°C to +105°C, AVDD = 5V, BVDD = 3V, CH x+ = 0.5V to 4.5V, CH x– = 2.5V, REFIN = REFOUT = internal +2.5V, CLKIN = 20MHz, and 16-bit Sinc3 filter with decimation by 256, unless otherwise noted.
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ADS1204 SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009........................................................................................................................................... www.ti.
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ADS1204 www.ti.com........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 TERMINAL FUNCTIONS (continued) TERMINAL NAME NO.
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ADS1204 SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009........................................................................................................................................... www.ti.com PARAMETER MEASUREMENT INFORMATION tC1 CLKIN tW1 tC2 tD1 tD2 CLKOUT tD3 tW2 tD4 OUT x Figure 1. ADS1204 Timing Diagram TIMING REQUIREMENTS: 5.0V (1) Over recommended operating free-air temperature range at –40°C to +105°C, AVDD = 5V, and BVDD = 5V, unless otherwise noted.
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ADS1204 www.ti.com........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 TYPICAL CHARACTERISTICS AVDD = 5V, BVDD = 3V, CH x+ = +0.5V to +4.5V, CH x– = +2.5V, REFIN = external, CLKSEL = 0, and 16-bit Sinc3 filter, with OSR = 256, unless otherwise noted. INTEGRAL NONLINEARITY vs INPUT SIGNAL (CLKIN = 20MHz) INTEGRAL NONLINEARITY vs INPUT SIGNAL (CLKIN = 32MHz) 1.0 1.0 0.
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ADS1204 SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009........................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) AVDD = 5V, BVDD = 3V, CH x+ = +0.5V to +4.5V, CH x– = +2.5V, REFIN = external, CLKSEL = 0, and 16-bit Sinc3 filter, with OSR = 256, unless otherwise noted. OFFSET vs POWER SUPPLY INTERNAL REFERENCE vs TEMPERATURE 2.530 -1.2 2.
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ADS1204 www.ti.com........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 TYPICAL CHARACTERISTICS (continued) AVDD = 5V, BVDD = 3V, CH x+ = +0.5V to +4.5V, CH x– = +2.5V, REFIN = external, CLKSEL = 0, and 16-bit Sinc3 filter, with OSR = 256, unless otherwise noted.
PAGE 12
ADS1204 SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009........................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) AVDD = 5V, BVDD = 3V, CH x+ = +0.5V to +4.5V, CH x– = +2.5V, REFIN = external, CLKSEL = 0, and 16-bit Sinc3 filter, with OSR = 256, unless otherwise noted.
PAGE 13
ADS1204 www.ti.com........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 GENERAL DESCRIPTION The ADS1204 is a four-channel, second-order, CMOS device with four delta-sigma (ΔΣ) modulators, designed for medium- to high-resolution A/D signal conversions from dc to 39kHz (filter response –3dB) if an oversampling ratio (OSR) of 64 is chosen.
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ADS1204 SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009........................................................................................................................................... www.ti.com +5V 27W R1 OPA4354 IN+ 0.1nF R2 +5V 27W R1 OPA4354 INR2 AVDD +5V BVDD 27W R1 CH A+ OPA4354 IN+ CH A- 0.1nF 2nd-Order DS Modulator R2 OUT A Output Interface Circuit REFIN A OUT D CLKOUT +5V CH B+ 27W R1 OUT B OUT C CH B- OPA4354 2nd-Order DS Modulator FPGA or ASIC +3V BVDD 0.
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ADS1204 www.ti.com........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 THEORY OF OPERATION The differential analog input of the ADS1204 is implemented with a switched-capacitor circuit. This circuit implements a second-order modulator stage, which digitizes the analog input signal into a 1-bit output stream. The clock source can be internal as well as external.
PAGE 16
ADS1204 SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009........................................................................................................................................... www.ti.com Modulator The ADS1204 can be operated in two modes. When CKLSEL = 1, the four modulators operate using the internal clock, which is fixed at 20MHz. When CKLSEL = 0, the modulators operate using an external clock . In both modes, the clock is divided by two internally and functions as the modulator clock.
PAGE 17
ADS1204 www.ti.com........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 DIGITAL INTERFACE INTRODUCTION The analog signal connected to the input of the ΔΣ modulator is converted using the clock signal applied to the modulator. The result of the conversion, or modulation, is generated and sent to the OUTx pin from the ΔΣ modulator.
PAGE 18
ADS1204 SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009........................................................................................................................................... www.ti.com The effective number of bits (ENOB) can be used to compare the performance of A/D converters and ΔΣ modulators. Figure 33 shows the ENOB of the ADS1204 with different filter types. In this data sheet, the ENOB is calculated from the SNR as shown in Equation 3: SNR = 1.76dB + 6.
PAGE 19
ADS1204 www.ti.com........................................................................................................................................... SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009 LAYOUT CONSIDERATIONS POWER SUPPLIES DECOUPLING An applied external digital filter rejects high-frequency noise. PSRR and CMRR improve at higher frequencies because the digital filter suppresses high-frequency noise.
PAGE 20
ADS1204 SBAS301C – OCTOBER 2003 – REVISED FEBRUARY 2009........................................................................................................................................... www.ti.com Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision B (August 2007) to Revision C ................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 27-Jul-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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PACKAGE MATERIALS INFORMATION www.ti.com 27-Jul-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant ADS1204IRHBR VQFN RHB 32 3000 330.0 12.4 5.3 5.3 1.5 8.0 12.0 Q2 ADS1204IRHBT VQFN RHB 32 250 180.0 12.4 5.3 5.3 1.5 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 27-Jul-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) ADS1204IRHBR VQFN RHB 32 3000 338.1 338.1 20.6 ADS1204IRHBT VQFN RHB 32 250 210.0 185.0 35.
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