Document
LTC1605-1/LTC1605-2 Single Supply 16-Bit, 100ksps, Sampling ADCs
FEATURES
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DESCRIPTIO
Sample Rate: 100ksps Complete 16-Bit Solution on a Single 5V Supply Unipolar Input Range: 0V to 4V (LTC1605-1) Bipolar Input Range: ±4V (LTC1605-2) Power Dissipation: 55mW Typ Signal-to-Noise Ratio: 86dB Typ Operates with Internal or External Reference Internal Synchronized Clock 28-Pin 0.3" PDIP and SSOP Packages
The LTC ®1605-1/LTC1605-2 are 100ksps, sampling 16-bit A/D converters that draw only 55mW (typical) from a single 5V supply. These easy-to-use devices include a sample-and-hold, precision reference, switched capacitor successive approximation A/D and trimmed internal clock. The LTC1605-1’s input range is 0V to 4V while the LTC1605-2’s input range is ±4V. An external reference can be used if greater accuracy over temperature is needed. The ADC has a microprocessor compatible, 16-bit or two byte parallel output port. A convert start input and a data ready signal (BUSY) ease connections to FIFOs, DSPs and microprocessors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U APPLICATIO S
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Industrial Process Control Multiplexed Data Acquisition Systems High Speed Data Acquisition for PCs Digital Signal Processing
TYPICAL APPLICATIO
LTC1605-1 Low Power, 100kHz, 16-Bit Sampling ADC on 5V Supply
5V 10µF 28 27 VDIG VANA 0V TO 4V 200Ω INPUT 33.2k 4 CAP BUSY 26 BUFFER 3 REF 4k 2.5V REFERENCE CONTROL LOGIC AND TIMING CS 25 R/C 24 BYTE 23 AGND1 2 AGND2 5 DGND 14
1605-1/2 TA01
0.1µF
1 VIN
4k
6 TO 13 15 TO 22 16-BIT SAMPLING ADC 20k 10k D15 TO D0
INL (LSBs)
16-BIT OR 2 BYTE PARALLEL BUS
2.5V 2.2µF
2.5V 2.2µF
DIGITAL CONTROL SIGNALS
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Typical INL Curve
2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 0 16384 32768 CODE
1605-1/2 TA02/G04
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49152 65535
1
LTC1605-1/LTC1605-2
ABSOLUTE
(Notes 1, 2)
AXI U RATI GS
W U PACKAGE/ORDER I FOR ATIO
TOP VIEW VIN 1 AGND1 2 REF 3 CAP 4 AGND2 5 D15 (MSB) 6 D14 7 D13 8 D12 9 D11 10 D10 11 D9 12 D8 13 DGND 14 G PACKAGE 28-LEAD PLASTIC SSOP 28 VDIG 27 VANA 26 BUSY 25 CS 24 R/C 23 BYTE 22 D0 21 D1 20 D2 19 D3 18 D4 17 D5 16 D6 15 D7 N PACKAGE 28-LEAD PDIP
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VANA .......................................................................... 7V VDIG to VANA ........................................................... 0.3V VDIG ........................................................................... 7V Ground Voltage Difference DGND, AGND1 and AGND2 .............................. ± 0.3V Analog Inputs (Note 3) VIN ..................................................................... ± 25V CAP ............................ VANA + 0.3V to AGND2 – 0.3V REF .................................... Indefinite Short to AGND2 Momentary Short to VANA Digital Input Voltage (Note 4) ........ VDGND – 0.3V to 10V Digital Output Voltage ........ VDGND – 0.3V to VDIG + 0.3V Power Dissipation .............................................. 500mW Operating Ambient Temperature Range LTC1605-1C/LTC1605-2C ....................... 0°C to 70°C LTC1605-1I/LTC1605-2I .................... – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C
CO VERTER CHARACTERISTICS
PARAMETER Resolution No Missing Codes Transition Noise Integral Linearity Error Zero Error Zero Error Drift Full-Scale Error Drift Full-Scale Error Full-Scale Error Drift Power Supply Sensitivity VANA = VDIG = VDD (Note 7) CONDITIONS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. With external reference (Notes 5, 6).
MIN
q q
Ext. Reference = 2.5V (Note 8)
Ext. Reference = 2.5V (Notes 12, 13) Ext. Reference = 2.5V VDD = 5V ± 5% (Note 9)
A ALOG I PUT
SYMBOL VIN PARAMETER
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The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 5)
CONDITIONS 4.75V ≤ VANA ≤ 5.25V, 4.75V ≤ VDIG ≤ 5.25V LTC1605-1 LTC1605-2
q q
Analog Input Range (Note 9)
CIN RIN
Analog Input Capacitance Analog Input Impedance
2
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W W
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ORDER PART NUMBER LTC1605-1CG LTC1605-1IG LTC1605-2CG LTC1605-2IG LTC1605-1CN LTC1605-1IN LTC1605-2CN LTC1605-2IN
TJMAX = 125°C, θJA = 95°C/W (G) TJMAX = 125°C, θJA = 130°C/W (N)
Consult factory for Military grade parts.
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TYP
MAX
UNITS Bits Bits
16 15 1 ±3 ±10 ±2 ±7
LSBRMS LSB mV ppm/°C ppm/°C ± 0.50 % ppm/°C ±8 LSB
q q
q
±2
MIN
TYP 0 to 4 ±4 10 10
MAX
UNITS V V pF kΩ
LTC1605-1/LTC1605-2
DY A IC ACCURACY
SYMBOL S/(N + D) PARAMETER
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Notes 5, 14)
CONDITIONS 1kHz Input Signal (Note 14) 10kHz Input Signal 20kHz, – 60dB Input Signal 1kHz Input Signal, First 5 Harmonics 10kHz Input Signal, First 5 Harmonics 1kHz Input Signal 10kHz Input Signal (Note 15) MIN TYP 87 85 30 – 101 – 92 – 101 – 92 275 40 Sufficient to Meet .