Datasheet LTC1099 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | High Speed 8-Bit A/D Converter with Built-In Sample-and-Hold |
| Pages / Page | 16 / 1 — FEATURES. DESCRIPTIO. KEY SPECIFICATIO S. TYPICAL APPLICATION. Infinite … |
| File Format / Size | PDF / 204 Kb |
| Document Language | English |
FEATURES. DESCRIPTIO. KEY SPECIFICATIO S. TYPICAL APPLICATION. Infinite Hold Time Sample-and-Hold (TACQ = 240ns)
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LTC1099 High Speed 8-Bit A/D Converter with Built-In Sample-and-Hold
U FEATURES DESCRIPTIO
■ Built-In Sample-and-Hold The LTC®1099 is a high speed microprocessor compatible ■ No Missing Codes 8-bit analog-to-digital converter (A/D). An internal sample- ■ No User Trims Required and-hold (S/H) allows the A/D to convert inputs up to the ■ All Timing Inputs Edge Sensitive for Easy Processor full Nyquist limit. With a conversion rate of 2.5µs, this Interface allows 156kHz 5VP-P input signals or slew rates as high as ■ Fast Conversion Time: 2.5µs 2.5V/µs, to be digitized without the need for an external ■ Latched Three-State Outputs S/H. ■ Single 5V Operation Two modes of operation, Read (RD) mode and Write-Read ■ No External Clock (WR-RD) mode, allow easy interface with processors. All ■ Overflow Output Allows Cascading timing is internal and edge sensitive which eliminates the ■ TC Input Allows User Adjustable Conversion Time need for external pulse shaping circuits. The Stand-Alone ■ 0.3" Wide 20-Pin PDIP (SA) mode is convenient for those applications not involv-
U
ing a processor.
KEY SPECIFICATIO S
Data outputs are latched with three-state control to allow ■ Resolution: 8-Bits easy interface to a processor data bus or I/O port. An ■ Conversion Time: 2.5µs (RD Mode) overflow output (OFL) is provided to allow cascading for 2.5µs (WR/RD Mode) higher resolution. ■ Slew Rate Limit (Internal S/H): 2.5V/µs ■ Low Power: 75mW Max ■ Total Unadjusted Error LTC1099: ±1 LSB LTC1099A: ±0.75 LSB , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATION Infinite Hold Time Sample-and-Hold (TACQ = 240ns) Signal-to-Noise Ratio (SNR) vs Input Frequency
5V 15V – 36 10k TA = 25°C 12 20 – 38 TC = 2.5µs REF+ V 14 CC 20 2.5k – 40 LTC1099 REF + V + 7 17 1 MODE DB7 B1 – 42 16 2 DB6 B2 1 15 3 18 2 V 7 IN V DB5 IN B3 + – 44 I 14 4 O DB4 B4 6 SAMPLE 6 5 5 AM6012 LT1022 VOUT – 46 WR/RDY DB3 B5 4 6 3 DB2 B6 I HOLD 8 3 7 O – 4 – 48 RD DB1 B7 19 2 8 DB0 B8 13 SIGNAL-TO-NOISE RATIO, SNR (dB) – 50 CS REF – V – GND REF – – 52 15 17 1 10 100 10 11 10k INPUT FREQUENCY (kHz) 1099 G08 –15V 1099 TA01 1
U FEATURES DESCRIPTIO
■ Built-In Sample-and-Hold The LTC®1099 is a high speed microprocessor compatible ■ No Missing Codes 8-bit analog-to-digital converter (A/D). An internal sample- ■ No User Trims Required and-hold (S/H) allows the A/D to convert inputs up to the ■ All Timing Inputs Edge Sensitive for Easy Processor full Nyquist limit. With a conversion rate of 2.5µs, this Interface allows 156kHz 5VP-P input signals or slew rates as high as ■ Fast Conversion Time: 2.5µs 2.5V/µs, to be digitized without the need for an external ■ Latched Three-State Outputs S/H. ■ Single 5V Operation Two modes of operation, Read (RD) mode and Write-Read ■ No External Clock (WR-RD) mode, allow easy interface with processors. All ■ Overflow Output Allows Cascading timing is internal and edge sensitive which eliminates the ■ TC Input Allows User Adjustable Conversion Time need for external pulse shaping circuits. The Stand-Alone ■ 0.3" Wide 20-Pin PDIP (SA) mode is convenient for those applications not involv-
U
ing a processor.
KEY SPECIFICATIO S
Data outputs are latched with three-state control to allow ■ Resolution: 8-Bits easy interface to a processor data bus or I/O port. An ■ Conversion Time: 2.5µs (RD Mode) overflow output (OFL) is provided to allow cascading for 2.5µs (WR/RD Mode) higher resolution. ■ Slew Rate Limit (Internal S/H): 2.5V/µs ■ Low Power: 75mW Max ■ Total Unadjusted Error LTC1099: ±1 LSB LTC1099A: ±0.75 LSB , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATION Infinite Hold Time Sample-and-Hold (TACQ = 240ns) Signal-to-Noise Ratio (SNR) vs Input Frequency
5V 15V – 36 10k TA = 25°C 12 20 – 38 TC = 2.5µs REF+ V 14 CC 20 2.5k – 40 LTC1099 REF + V + 7 17 1 MODE DB7 B1 – 42 16 2 DB6 B2 1 15 3 18 2 V 7 IN V DB5 IN B3 + – 44 I 14 4 O DB4 B4 6 SAMPLE 6 5 5 AM6012 LT1022 VOUT – 46 WR/RDY DB3 B5 4 6 3 DB2 B6 I HOLD 8 3 7 O – 4 – 48 RD DB1 B7 19 2 8 DB0 B8 13 SIGNAL-TO-NOISE RATIO, SNR (dB) – 50 CS REF – V – GND REF – – 52 15 17 1 10 100 10 11 10k INPUT FREQUENCY (kHz) 1099 G08 –15V 1099 TA01 1
