Datasheet LTC2242-10 (Analog Devices) - 9
| Fabricante | Analog Devices |
| Descripción | 10-Bit, 250Msps ADC |
| Páginas / Página | 30 / 9 — pin FuncTions (CMOS Mode). A +. IN (Pins 1, 2):. OFB (Pin 37):. A –. IN … |
| Formato / tamaño de archivo | PDF / 602 Kb |
| Idioma del documento | Inglés |
pin FuncTions (CMOS Mode). A +. IN (Pins 1, 2):. OFB (Pin 37):. A –. IN (Pins 3, 4):. REFHA (Pins 5, 6):. CLKOUTB (Pin 38):
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LTC2242-10
pin FuncTions (CMOS Mode) A + IN (Pins 1, 2):
Positive Differential Analog Input.
OFB (Pin 37):
Over/Under Flow Output for B Bus. High
A –
when an over or under flow has occurred. At high imped-
IN (Pins 3, 4):
Negative Differential Analog Input. ance in full rate CMOS mode.
REFHA (Pins 5, 6):
ADC High Reference. Bypass to Pins 7, 8 with 0.1µF ceramic chip capacitor, to Pins 11,
CLKOUTB (Pin 38):
Data Valid Output for B Bus. In demux 12 with a 2.2µF ceramic capacitor and to ground with 1µF mode with interleaved update, latch B bus data on the fall- ceramic capacitor. ing edge of CLKOUTB. In demux mode with simultaneous update, latch B bus data on the rising edge of CLKOUTB.
REFLB (Pins 7, 8):
ADC Low Reference. Bypass to Pins This pin does not become high impedance in full rate 5, 6 with 0.1µF ceramic chip capacitor. Do not connect to CMOS mode. Pins 11, 12.
CLKOUTA (Pin 39):
Data Valid Output for A Bus. Latch A
REFHB (Pins 9, 10):
ADC High Reference. Bypass to bus data on the falling edge of CLKOUTA. Pins 11, 12 with 0.1µF ceramic chip capacitor. Do not connect to Pins 5, 6.
DA0-DA9 (Pins 44, 45, 46, 47, 48, 51, 52, 53, 54, 55):
Digital Outputs, A Bus. DA9 is the MSB.
REFLA (Pins 11, 12):
ADC Low Reference. Bypass to Pins 9, 10 with 0.1µF ceramic chip capacitor, to Pins 5,
OFA (Pin 56):
Over/Under Flow Output for A Bus. High 6 with a 2.2µF ceramic capacitor and to ground with 1µF when an over or under flow has occurred. ceramic capacitor.
LVDS (Pin 57):
Output Mode Selection Pin. Connecting
V
LVDS to 0V selects full rate CMOS mode. Connecting LVDS
DD (Pins 13, 14, 15, 62, 63):
2.5V Supply. Bypass to GND with 0.1µF ceramic chip capacitors. to 1/3VDD selects demux CMOS mode with simultaneous update. Connecting LVDS to 2/3V
GND (Pins 16, 61, 64):
ADC Power Ground. DD selects demux CMOS mode with interleaved update. Connecting LVDS to VDD
ENC+ (Pin 17):
Encode Input. Conversion starts on the selects LVDS mode. positive edge.
MODE (Pin 58):
Output Format and Clock Duty Cycle
ENC– (Pin 18):
Encode Complement Input. Conversion Stabilizer Selection Pin. Connecting MODE to 0V selects starts on the negative edge. Bypass to ground with 0.1µF offset binary output format and turns the clock duty cycle ceramic for single-ended encode signal. stabilizer off. Connecting MODE to 1/3VDD selects offset
SHDN (Pin 19):
Shutdown Mode Selection Pin. Connecting binary output format and turns the clock duty cycle stabilizer SHDN to GND and OE to GND results in normal operation on. Connecting MODE to 2/3VDD selects 2’s complement with the outputs enabled. Connecting SHDN to GND and output format and turns the clock duty cycle stabilizer on. OE to VDD results in normal operation with the outputs at Connecting MODE to VDD selects 2’s complement output high impedance. Connecting SHDN to VDD and OE to GND format and turns the clock duty cycle stabilizer off. results in nap mode with the outputs at high impedance.
SENSE (Pin 59):
Reference Programming Pin. Connecting Connecting SHDN to VDD and OE to VDD results in sleep SENSE to VCM selects the internal reference and a ±0.5V mode with the outputs at high impedance. input range. Connecting SENSE to VDD selects the internal
OE (Pin 20):
Output Enable Pin. Refer to SHDN pin function. reference and a ±1V input range. An external reference
DNC (Pins 21, 22, 40, 43):
Do not connect these pins. greater than 0.5V and less than 1V applied to SENSE selects an input range of ±V
DB0-DB9 (Pins 23, 24, 27, 28, 29, 30, 31, 32, 35, 36):
SENSE. ±1V is the largest valid input range. Digital Outputs, B Bus. DB9 is the MSB. At high impedance in full rate CMOS mode.
VCM (Pin 60):
1.25V Output and Input Common Mode Bias. Bypass to ground with 2.2µF ceramic chip capacitor.
OGND (Pins 25, 33, 41, 50):
Output Driver Ground.
GND (Exposed Pad) (Pin 65):
ADC Power Ground. The
OVDD (Pins 26, 34, 42, 49):
Positive Supply for the exposed pad on the bottom of the package needs to be Output Drivers. Bypass to ground with 0.1µF ceramic chip soldered to ground. capacitor. 224210fd 9 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Converter Characteristics Analog Input Dynamic Accuracy Internal Reference Characteristics Digital Inputs and Digital Outputs Power Requirements Timing Characteristics Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Timing Diagrams Applications Information Package Description Revision History Related Parts
pin FuncTions (CMOS Mode) A + IN (Pins 1, 2):
Positive Differential Analog Input.
OFB (Pin 37):
Over/Under Flow Output for B Bus. High
A –
when an over or under flow has occurred. At high imped-
IN (Pins 3, 4):
Negative Differential Analog Input. ance in full rate CMOS mode.
REFHA (Pins 5, 6):
ADC High Reference. Bypass to Pins 7, 8 with 0.1µF ceramic chip capacitor, to Pins 11,
CLKOUTB (Pin 38):
Data Valid Output for B Bus. In demux 12 with a 2.2µF ceramic capacitor and to ground with 1µF mode with interleaved update, latch B bus data on the fall- ceramic capacitor. ing edge of CLKOUTB. In demux mode with simultaneous update, latch B bus data on the rising edge of CLKOUTB.
REFLB (Pins 7, 8):
ADC Low Reference. Bypass to Pins This pin does not become high impedance in full rate 5, 6 with 0.1µF ceramic chip capacitor. Do not connect to CMOS mode. Pins 11, 12.
CLKOUTA (Pin 39):
Data Valid Output for A Bus. Latch A
REFHB (Pins 9, 10):
ADC High Reference. Bypass to bus data on the falling edge of CLKOUTA. Pins 11, 12 with 0.1µF ceramic chip capacitor. Do not connect to Pins 5, 6.
DA0-DA9 (Pins 44, 45, 46, 47, 48, 51, 52, 53, 54, 55):
Digital Outputs, A Bus. DA9 is the MSB.
REFLA (Pins 11, 12):
ADC Low Reference. Bypass to Pins 9, 10 with 0.1µF ceramic chip capacitor, to Pins 5,
OFA (Pin 56):
Over/Under Flow Output for A Bus. High 6 with a 2.2µF ceramic capacitor and to ground with 1µF when an over or under flow has occurred. ceramic capacitor.
LVDS (Pin 57):
Output Mode Selection Pin. Connecting
V
LVDS to 0V selects full rate CMOS mode. Connecting LVDS
DD (Pins 13, 14, 15, 62, 63):
2.5V Supply. Bypass to GND with 0.1µF ceramic chip capacitors. to 1/3VDD selects demux CMOS mode with simultaneous update. Connecting LVDS to 2/3V
GND (Pins 16, 61, 64):
ADC Power Ground. DD selects demux CMOS mode with interleaved update. Connecting LVDS to VDD
ENC+ (Pin 17):
Encode Input. Conversion starts on the selects LVDS mode. positive edge.
MODE (Pin 58):
Output Format and Clock Duty Cycle
ENC– (Pin 18):
Encode Complement Input. Conversion Stabilizer Selection Pin. Connecting MODE to 0V selects starts on the negative edge. Bypass to ground with 0.1µF offset binary output format and turns the clock duty cycle ceramic for single-ended encode signal. stabilizer off. Connecting MODE to 1/3VDD selects offset
SHDN (Pin 19):
Shutdown Mode Selection Pin. Connecting binary output format and turns the clock duty cycle stabilizer SHDN to GND and OE to GND results in normal operation on. Connecting MODE to 2/3VDD selects 2’s complement with the outputs enabled. Connecting SHDN to GND and output format and turns the clock duty cycle stabilizer on. OE to VDD results in normal operation with the outputs at Connecting MODE to VDD selects 2’s complement output high impedance. Connecting SHDN to VDD and OE to GND format and turns the clock duty cycle stabilizer off. results in nap mode with the outputs at high impedance.
SENSE (Pin 59):
Reference Programming Pin. Connecting Connecting SHDN to VDD and OE to VDD results in sleep SENSE to VCM selects the internal reference and a ±0.5V mode with the outputs at high impedance. input range. Connecting SENSE to VDD selects the internal
OE (Pin 20):
Output Enable Pin. Refer to SHDN pin function. reference and a ±1V input range. An external reference
DNC (Pins 21, 22, 40, 43):
Do not connect these pins. greater than 0.5V and less than 1V applied to SENSE selects an input range of ±V
DB0-DB9 (Pins 23, 24, 27, 28, 29, 30, 31, 32, 35, 36):
SENSE. ±1V is the largest valid input range. Digital Outputs, B Bus. DB9 is the MSB. At high impedance in full rate CMOS mode.
VCM (Pin 60):
1.25V Output and Input Common Mode Bias. Bypass to ground with 2.2µF ceramic chip capacitor.
OGND (Pins 25, 33, 41, 50):
Output Driver Ground.
GND (Exposed Pad) (Pin 65):
ADC Power Ground. The
OVDD (Pins 26, 34, 42, 49):
Positive Supply for the exposed pad on the bottom of the package needs to be Output Drivers. Bypass to ground with 0.1µF ceramic chip soldered to ground. capacitor. 224210fd 9 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Converter Characteristics Analog Input Dynamic Accuracy Internal Reference Characteristics Digital Inputs and Digital Outputs Power Requirements Timing Characteristics Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Timing Diagrams Applications Information Package Description Revision History Related Parts