Datasheet

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ADS7886

www.ti.com

SLAS492A –SEPTEMBER 2005–REVISED NOVEMBER 2009

12-Bit, 1-MSPS, MICRO-POWER, MINIATURE

SAR ANALOG-TO-DIGITAL CONVERTERS

Check for Samples: ADS7886

FEATURES

APPLICATIONS

• Base Band Converters in Radio

• 1-MHz Sample Rate Serial Device

Communication

• 12-Bit Resolution

• Motor Current/Bus Voltage Sensors in Digital

• Zero Latency

Drives

• 20-MHz Serial Interface

• Optical Networking (DWDM, MEMS Based

• Supply Range: 2.35 V to 5.25 V

Switching)

• Typical Power Dissipation at 1 MSPS:

• Optical Sensors

• Battery Powered Systems

– 3.9 mW at 3-V V

• Medical Instrumentations

– 7.5 mW at 5-V V

• High-Speed Data Acquisition Systems

• INL ±1.25 LSB Maximum, ±0.65 LSB (Typical)

• High-Speed Closed-Loop Systems

• DNL ±1 LSB Maximum, +0.4 / -0.65 LSB

(Typical)

• Typical AC Performance:

72.25 dB SINAD, -84 dB THD

• Unipolar Input Range: 0 V to V

• Power Down Current: 1 µA

• Wide Input Bandwidth: 15 MHz at 3 dB

• 6-Pin SOT23 and SC70 Packages

DESCRIPTION

The ADS7886 is a 12-bit, 1-MSPS analog-to-digital converter (ADC). The device includes a capacitor based SAR

A/D converter with inherent sample and hold. The serial interface in each device is controlled by the CS and

SCLK signals for glueless connections with microprocessors and DSPs. The input signal is sampled with the

falling edge of CS, and SCLK is used for conversion and serial data output.

The device operates from a wide supply range from 2.35 V to 5.25 V. The low power consumption of the device

makes it suitable for battery-powered applications. The device also includes a powerdown feature for power

saving at lower conversion speeds.

The high level of the digital input to the device is not limited to device V

. This means the digital input can go as

high as 5.25 V when device supply is 2.35 V. This feature is useful when digital signals are coming from other

circuit with different supply levels. Also this relaxes restriction on power up sequencing.

The ADS7886 is available in 6-pin SOT23 and SC70 packages and is specified for operation from -40°C to

125°C.

Table 1. Micro-Power Miniature SAR Converter Family

BIT < 300 KSPS 300 KSPS – 1.25 MSPS

12-Bit ADS7866 (1.2 V

to 3.6 V

) ADS7886 (2.35 V

to 5.25 V

)

10-Bit ADS7867 (1.2 V

to 3.6 V

) ADS7887 (2.35 V

to 5.25 V

)

8-Bit ADS7868 (1.2 V

to 3.6 V

) ADS7888 (2.35 V

to 5.25 V

)

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.

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 (23 pages)

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ADS7886 www.ti.com SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 12-Bit, 1-MSPS, MICRO-POWER, MINIATURE SAR ANALOG-TO-DIGITAL CONVERTERS Check for Samples: ADS7886 FEATURES APPLICATIONS • • • • • • • 1 • • • • • • • 1-MHz Sample Rate Serial Device 12-Bit Resolution Zero Latency 20-MHz Serial Interface Supply Range: 2.35 V to 5.25 V Typical Power Dissipation at 1 MSPS: – 3.9 mW at 3-V VDD – 7.5 mW at 5-V VDD INL ±1.25 LSB Maximum, ±0.65 LSB (Typical) DNL ±1 LSB Maximum, +0.4 / -0.
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ADS7886 SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 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. ESD damage can range from subtle performance degradation to complete device failure.
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ADS7886 www.ti.com SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 ABSOLUTE MAXIMUM RATINGS (1) UNIT +IN to AGND –0.3 V to +VDD +0.3 V +VDD to AGND –0.3 V to 7 V Digital input voltage to GND –0.3 V to (7 V) Digital output to GND –0.3 V to (+VDD + 0.
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ADS7886 SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 www.ti.com ELECTRICAL CHARACTERISTICS (continued) +VDD = 2.35 V to 5.25 V, TA = –40°C to 125°C, f(sample) = 1 MHz (unless otherwise noted) PARAMETER MIN TYP VDD = 2.35 V to 3.6 V, fI = 100 kHz TEST CONDITIONS 69 71.25 VDD = 4.75 V to 5.25 V, fI = 100 kHz 70 72.25 SINAD Signal-to-noise and distortion THD Total harmonic distortion (5) fI = 100 kHz –84 SFDR Spurious free dynamic range fI = 100 kHz 85.
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ADS7886 www.ti.com SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 TIMING REQUIREMENTS (see Figure 1 and Figure 2) All specifications typical at TA = –40°C to 125°C, VDD = 2.35 V to 5.25 V (unless otherwise specified).
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ADS7886 SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 www.ti.com DEVICE INFORMATION SOT23/SC70 PACKAGE (TOP VIEW) VDD 1 6 CS GND 2 5 SDO VIN 3 4 SCLK TERMINAL FUNCTIONS TERMINAL NAME I/O NO. DESCRIPTION VDD 1 – Power supply input also acts like a reference voltage to ADC. GND 2 – Ground for power supply, all analog and digital signals are referred with respect to this pin.
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ADS7886 www.ti.com SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 POWER DOWN MODE The device enters power down mode if CS goes high anytime after the 2nd SCLK falling edge to before the 10th SCLK falling edge. Ongoing conversion stops and SDO goes to 3-state under this power down condition as shown in Figure 2. td6 td5 CS 1 2 3 4 5 9 10 16 SCLK SDO Figure 2. Entering Power Down Mode A dummy cycle with CS low for more than 10 SCLK falling edges brings the device out of power down mode.
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ADS7886 SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 www.ti.com TYPICAL CHARACTERISTICS SUPPLY CURRENT vs SUPPLY VOLTAGE SUPPLY CURRENT vs SCLK FREQUENCY 1.6 1.6 fs = 1 MSPS, fSCLK = 20 MHz fSCLK = 20 MHz, o TA = 25 C, Power Down Wih SCLK = Free Running 1.4 o 125 C 1.2 o 25 C 1.3 1.2 o −40 C 1.2 IDD − Supply Current − mA IDD − Supply Current − mA IDD − Supply Current − mA 1.4 o TA = 25 C 1.5 1.4 SUPPLY CURRENT vs SAMPLE RATE 5V 1 2.35 V 0.8 0.6 0.4 1 0.8 5V 0.6 0.4 2.
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ADS7886 www.ti.com SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 TYPICAL CHARACTERISTICS SIGNAL-TO-NOISE RATIO vs SUPPLY VOLTAGE 73 73 72.5 72.5 72 71.5 71 70.5 fs = 1 MSPS, VDD = 5 V, 70 o TA = 25 C SNR − Signal-to-Noise Ratio − dB 73 72 71.5 71 70.5 fs = 1 MSPS, fI = 100 kHz, 70 o TA = 25 C 69.5 69.5 69 10 100 fI − Input Frequency − kHz 2.35 1000 5V 72 71.5 2.35 V 71 70.5 fs = 1 MSPS, 70 fI = 100 kHz 69.5 69 1 3.075 3.8 4.525 69 −40 5.
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ADS7886 SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 www.ti.com TYPICAL CHARACTERISTICS (continued) OFFSET ERROR vs SUPPLY VOLTAGE OFFSET ERROR vs FREE-AIR TEMPERATURE 1 1 1.5 EO − Offset Error - LSBs 1 0.5 0 -0.5 fs = 1 MSPS, o TA = 25 C 0.8 fs = 1 MSPS, VDD = 5 V 0.75 0.6 0.5 EG − Gain Error - LSBs fs = 1 MSPS, o TA = 25 C EO − Offset Error - LSBs GAIN ERROR vs SUPPLY VOLTAGE 0.25 0 -0.25 0.4 0.2 0 −0.2 −0.4 -0.5 −0.6 -1 -0.75 -1.5 2.35 3.075 3.8 4.525 −0.8 -1 −40 5.
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ADS7886 www.ti.com SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 TYPICAL CHARACTERISTICS (continued) DNL 1 0.8 VDD = 2.35 V, fs = 1 MSPS, o TA = 25 C DNL - LSBs 0.6 0.4 0.2 0 −0.2 −0.4 −0.6 −0.8 −1 0 1024 2048 3072 4096 3072 4096 Output Code Figure 25. INL 1 0.8 INL - LSBs 0.6 0.4 0.2 0 −0.2 −0.4 VDD = 2.35 V, fs = 1 MSPS, TA = 25oC −0.6 −0.8 −1 0 1024 2048 Output Code Figure 26. FFT 0 VDD = 2.
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ADS7886 SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 www.ti.com APPLICATION INFORMATION VDD 20 W 60 W IN 16 pF 60 W 5 pF GND Figure 28. Typical Equivalent Sampling Circuit Driving the VIN and VDD Pins The VIN input should be driven with a low impedance source. In most cases additional buffers are not required. In cases where the source impedance exceeds 200 Ω, using a buffer would help achieve the rated performance of the converter. The THS4031 is a good choice for the driver amplifier buffer.
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ADS7886 www.ti.com SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 5V C1 R1 10 W 7V _ R2 VDD CS VIN SDO GND SCLK + 1 mF 1 mF 10 nF Figure 31.
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ADS7886 SLAS492A – SEPTEMBER 2005 – REVISED NOVEMBER 2009 www.ti.com REVISION HISTORY Changes from Original (SEPTEMBER 2005) to Revision A Page • Added VIH information ........................................................................................................................................................... 4 • Changed VIH information .......................................................................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2013 (4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Top-Side Marking for that device. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ ADS7886SBDBVR SOT-23 3000 177.8 9.7 3.2 DBV 6 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.1 1.39 4.0 8.0 Q3 ADS7886SBDBVT SOT-23 DBV 6 250 177.8 9.7 3.2 3.1 1.39 4.0 8.0 Q3 ADS7886SBDCKR SC70 DCK 6 3000 177.8 9.7 2.3 2.52 1.2 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) ADS7886SBDBVR SOT-23 DBV 6 3000 184.0 184.0 50.0 ADS7886SBDBVT SOT-23 DBV 6 250 184.0 184.0 50.0 ADS7886SBDCKR SC70 DCK 6 3000 184.0 184.0 50.0 ADS7886SBDCKT SC70 DCK 6 250 184.0 184.0 50.0 ADS7886SDBVR SOT-23 DBV 6 3000 184.0 184.0 50.0 ADS7886SDBVT SOT-23 DBV 6 250 184.0 184.0 50.
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