ADS7887SDBVT ,10-/8-Bit, 1.25-MSPS, MICRO-POWER, MINIATURE SAR ANALOG-TO-DIGITAL CONVERTERSFeatures 3 DescriptionThe ADS7887 device is a 10-bit, 1.25-MSPS, analog-1• 1.25-MHz Sample Rate Ser ..
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ADS7888SDCKR ,10-/8-Bit, 1.25-MSPS, MICRO-POWER, MINIATURE SAR ANALOG-TO-DIGITAL CONVERTERS SLAS468A–JUNE 2005–REVISED AUGUST 20165 Companion ProductsPART NUMBER NAMESN74LVTH245A 3.3-V ABT O ..
ADS7888SDCKT ,10-/8-Bit, 1.25-MSPS, MICRO-POWER, MINIATURE SAR ANALOG-TO-DIGITAL CONVERTERSBlock Diagram... 164 Revision HistoryNOTE: Page numbers for previous revisions may differ from page ..
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ADS7887SDBVT
10-/8-Bit, 1.25-MSPS, MICRO-POWER, MINIATURE SAR ANALOG-TO-DIGITAL CONVERTERS
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ADS788x 10-Bit, 8-Bit, 1.25-MSPS,
Miniature SAR Analog-to-Digital Features 1.25-MHz Sample Rate Serial Device 10-Bit Resolution (ADS7887) 8-Bit Resolution (ADS7888) Zero Latency 25-MHz Serial Interface Supply Range: 2.35Vto 5.25V Typical Power Dissipationat 1.25 MSPS: 3.8 mWat 3-V VDD 8 mwat 5-V VDD ±0.35 LSB INL, DNL (ADS7887) ±0.15 LSB INL, ±0.1 LSB DNL (ADS7888) 61 dB SINAD, –84 dB THD (ADS7887) 49.5 dB SINAD, –67.5 dB THD (ADS7888) Unipolar Input Range:0Vto VDD Power-Down Current:1 µA Wide Input Bandwidth:15 MHzat3 dB 6-Pin SOT23 and SC70 Packages
Applications Base Band Convertersin Radio Communication Motor Current and Bus Voltage Sensorsin Digital
Drives Optical Networking (DWDM, MEMS-Based
Switching) Optical Sensors Battery-Powered Systems Medical Instrumentations High-Speed Data Acquisition Systems High-Speed Closed-Loop Systems
DescriptionThe ADS7887 deviceisa 10-bit, 1.25-MSPS, analog-
to-digital converter (ADC), and the ADS7888 devicea 8-bit, 1.25-MSPS ADC. These devices includea
capacitor-based SAR A/D converter with inherent
sample and hold. The serial interfacein each device controlledby the CS and SCLK signalsfor glueless
connections with microprocessors and DSPs. The
input signalis sampled with the falling edgeof CS,
and SCLKis used for conversion and serial data
output.
The devices operate froma wide supply range from
2.35Vto 5.25V. The low power consumptionof the
devices make them suitable for battery-powered
applications. The devices also includea power-
saving, power-down feature for when the devices are
operatedat lower conversion speeds.
The high levelof the digital inputto the deviceis not
limitedto device VDD. This means the digital input canas high as 5.25V when device supplyis 2.35V.
This featureis useful when digital signals are coming
from other circuit with different supply levels. Also this
relaxes restrictionon power-up sequencing.
The ADS7887 and ADS7888 are availablein 6-pin
SOT-23 and SC70 packages and are specified for
operation from –40°Cto 125°C.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Functional Block Diagram
