ADS7891
器件描述：14BIT 3 MSPS LOW POWER SAR ANALOG TO DIGITAL CONVERTER
器件厂商：BURR-BROWN [Burr-Brown Corporation]
文件大小：329.84KB，共26页
Sponsor by e络盟器件资料摘要：
C0065C0068C0083C0055C0056C0057C0049
SLAS410 − DECEMBER 2003
C0049C0052C0262C0066C0073C0084C0044 C0051C0262C0077C0083C0080C0083
C0076C0079C0087 C0080C0079C0087C0069C0082 C0083C0065C0082 C0065C0078C0065C0076C0079C0071C0262C0084C0079C0262C0068C0073C0071C0073C0084C0065C0076 C0067C0079C0078C0086C0069C0082C0084C0069C0082
FEATURES
C0068 3 MHz Sample Rate, 14-Bit Resolution
C0068 Zero Latency
C0068 Unipolar, Pseudo Differential Input, Range:
− 0 V to 2.5 V
C0068 High Speed Parallel Interface
C0068 78 dB SNR and 88.5 dB THD at 3 MSPS
C0068 Power Dissipation 85 mW at 3 MSPS
C0068 Nap Mode (10 mW Power Dissipation)
C0068 Power Down (10 C0109W)
C0068 Internal Reference
C0068 Internal Reference Buffer
C0068 8-/14-Bit Bus Transfer
C0068 48-Pin TQFP Package
APPLICATIONS
C0068 Optical Networking (DWDM, MEMS Based
Switching)
C0068 Spectrum Analyzers
C0068 High Speed Data Acquisition Systems
C0068 High Speed Close-Loop Systems
C0068 Telecommunication
C0068 Ultra-Sound Detection
DESCRIPTION
The ADS7891 is a 14-bit 3-MSPS A-to-D converter with 2.5-V internal reference. The device includes a
capacitor based SAR A/D converter with inherent sample and hold. The device offers a 14-bit parallel interface
with an additional byte mode that provides easy interface with 8-bit processors. The device has a
pseudo-differential input stage.
The −IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor
and also to cancel common-mode noise. With nap mode enabled, the device operates at lower power when
used at lower conversion rates. The device is available in a 48-pin TQFP package.
_
+
SAR
Output
Latches
and
3-State
Drivers
BYTE
14/8-Bit Parallel
Data Output Bus
Conversion
and
Control Logic
CONVST
BUSY
CS
RD
A_PWDPWD/RST
CDAC
Comparator
CLOCK
2.5 V
Internal
Reference
+IN
−IN
REFIN
REFOUT
C0080C0082C0079C0068C0085C0067C0084C0073C0079C0078 C0068C0065C0084C0065 C0105C0110C0102C0111C0114C0109C0097C0116C0105C0111C0110 C0105C0115 C0099C0117C0114C0114C0101C0110C0116 C0097C0115 C0111C0102 C0112C0117C0098C0108C0105C0099C0097C0116C0105C0111C0110 C0100C0097C0116C0101C0046 C0080C0114C0111C0100C0117C0099C0116C0115
C0099C0111C0110C0102C0111C0114C0109 C0116C0111 C0115C0112C0101C0099C0105C0102C0105C0099C0097C0116C0105C0111C0110C0115 C0112C0101C0114 C0116C0104C0101 C0116C0101C0114C0109C0115 C0111C0102 C0084C0101C0120C0097C0115 C0073C0110C0115C0116C0114C0117C0109C0101C0110C0116C0115 C0115C0116C0097C0110C0100C0097C0114C0100 C0119C0097C0114C0114C0097C0110C0116C0121C0046
C0080C0114C0111C0100C0117C0099C0116C0105C0111C0110 C0112C0114C0111C0099C0101C0115C0115C0105C0110C0103 C0100C0111C0101C0115 C0110C0111C0116 C0110C0101C0099C0101C0115C0115C0097C0114C0105C0108C0121 C0105C0110C0099C0108C0117C0100C0101 C0116C0101C0115C0116C0105C0110C0103 C0111C0102 C0097C0108C0108 C0112C0097C0114C0097C0109C0101C0116C0101C0114C0115C0046
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.
Copyright 2003, Texas Instruments Incorporated
SLAS410 − DECEMBER 2003
C0049C0052C0262C0066C0073C0084C0044 C0051C0262C0077C0083C0080C0083
C0076C0079C0087 C0080C0079C0087C0069C0082 C0083C0065C0082 C0065C0078C0065C0076C0079C0071C0262C0084C0079C0262C0068C0073C0071C0073C0084C0065C0076 C0067C0079C0078C0086C0069C0082C0084C0069C0082
FEATURES
C0068 3 MHz Sample Rate, 14-Bit Resolution
C0068 Zero Latency
C0068 Unipolar, Pseudo Differential Input, Range:
− 0 V to 2.5 V
C0068 High Speed Parallel Interface
C0068 78 dB SNR and 88.5 dB THD at 3 MSPS
C0068 Power Dissipation 85 mW at 3 MSPS
C0068 Nap Mode (10 mW Power Dissipation)
C0068 Power Down (10 C0109W)
C0068 Internal Reference
C0068 Internal Reference Buffer
C0068 8-/14-Bit Bus Transfer
C0068 48-Pin TQFP Package
APPLICATIONS
C0068 Optical Networking (DWDM, MEMS Based
Switching)
C0068 Spectrum Analyzers
C0068 High Speed Data Acquisition Systems
C0068 High Speed Close-Loop Systems
C0068 Telecommunication
C0068 Ultra-Sound Detection
DESCRIPTION
The ADS7891 is a 14-bit 3-MSPS A-to-D converter with 2.5-V internal reference. The device includes a
capacitor based SAR A/D converter with inherent sample and hold. The device offers a 14-bit parallel interface
with an additional byte mode that provides easy interface with 8-bit processors. The device has a
pseudo-differential input stage.
The −IN swing of ±200 mV is useful to compensate for ground voltage mismatch between the ADC and sensor
and also to cancel common-mode noise. With nap mode enabled, the device operates at lower power when
used at lower conversion rates. The device is available in a 48-pin TQFP package.
_
+
SAR
Output
Latches
and
3-State
Drivers
BYTE
14/8-Bit Parallel
Data Output Bus
Conversion
and
Control Logic
CONVST
BUSY
CS
RD
A_PWDPWD/RST
CDAC
Comparator
CLOCK
2.5 V
Internal
Reference
+IN
−IN
REFIN
REFOUT
C0080C0082C0079C0068C0085C0067C0084C0073C0079C0078 C0068C0065C0084C0065 C0105C0110C0102C0111C0114C0109C0097C0116C0105C0111C0110 C0105C0115 C0099C0117C0114C0114C0101C0110C0116 C0097C0115 C0111C0102 C0112C0117C0098C0108C0105C0099C0097C0116C0105C0111C0110 C0100C0097C0116C0101C0046 C0080C0114C0111C0100C0117C0099C0116C0115
C0099C0111C0110C0102C0111C0114C0109 C0116C0111 C0115C0112C0101C0099C0105C0102C0105C0099C0097C0116C0105C0111C0110C0115 C0112C0101C0114 C0116C0104C0101 C0116C0101C0114C0109C0115 C0111C0102 C0084C0101C0120C0097C0115 C0073C0110C0115C0116C0114C0117C0109C0101C0110C0116C0115 C0115C0116C0097C0110C0100C0097C0114C0100 C0119C0097C0114C0114C0097C0110C0116C0121C0046
C0080C0114C0111C0100C0117C0099C0116C0105C0111C0110 C0112C0114C0111C0099C0101C0115C0115C0105C0110C0103 C0100C0111C0101C0115 C0110C0111C0116 C0110C0101C0099C0101C0115C0115C0097C0114C0105C0108C0121 C0105C0110C0099C0108C0117C0100C0101 C0116C0101C0115C0116C0105C0110C0103 C0111C0102 C0097C0108C0108 C0112C0097C0114C0097C0109C0101C0116C0101C0114C0115C0046
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.
Copyright 2003, Texas Instruments Incorporated