MAX194 Datasheet, PDF (1/24 Pages) Maxim Integrated Products – 14-Bit, 85ksps ADC with 10A Shutdown

19-0345; Rev 4; 12/97
EVAALVUAAILTAIOBNLEKIT
14-Bit, 85ksps ADC with 10µA Shutdown
_______________General Description
The MAX194 is a 14-bit successive-approximation ana-
log-to-digital converter (ADC) that combines high
speed, high accuracy, low power consumption, and a
10µA shutdown mode. Internal calibration circuitry cor-
rects linearity and offset errors to maintain the full rated
performance over the operating temperature range
without external adjustments. The capacitive-DAC
architecture provides an inherent 85ksps track/hold
function.
The MAX194, with an external reference (up to +5V),
offers a unipolar (0V to V_REF) or bipolar (-V_REF to V_REF)
pin-selectable input range. Separate analog and digital
supplies minimize digital-noise coupling.
The chip select (CS) input controls the three-state seri-
al-data output. The output can be read either during
conversion as the bits are determined, or following con-
version at up to 5Mbps using the serial clock (SCLK).
The end-of-conversion (EOC) output can be used to
interrupt a processor, or can be connected directly to
the convert input (CONV) for continuous, full-speed
conversions.
The MAX194 is available in 16-pin DIP, wide SO, and
ceramic sidebraze packages. The output data format
provides pin-for-pin and functional compatibility with
the 16-bit MAX195 ADC.
________________________Applications
Portable Instruments
Audio
Industrial Controls
Robotics
Multiple Transducer
Measurements
Medical Signal
Acquisition
Vibrations Analysis
Digital Signal
Processing
__________________Pin Configuration
TOP VIEW
BP/UP/SHDN ₁
CLK ₂
SCLK ₃
VDDD ₄
DOUT ₅
DGND 6
EOC ₇
CS ₈
MAX194
16 ^VDDA
15 ^VSSA
14 ^AGND
13 ^AIN
12 REF
11 VSSD
10 RESET
9 CONV
DIP/Wide SO/Ceramic SB
____________________________Features
o True 14-Bit Accuracy: ¹â„₂LSB INL
82dB SINAD
o 9.4µs Conversion Time
o 10µA Shutdown Mode
o Built-In Track/Hold
o AC and DC Specified
o Unipolar (0V to V_REF) and Bipolar (-V_REF to V_REF)
Input Range
o Three-State Serial-Data Output
o Small 16-Pin DIP, SO, and Ceramic SB Packages
o Pin-Compatible 16-Bit Upgrade (MAX195)
______________Ordering Information
PART
MAX194ACPE
MAX194BCPE
MAX194ACWE
MAX194BCWE
MAX194AEPE
MAX194BEPE
MAX194AEWE
MAX194BEWE
MAX194AMDE
MAX194BMDE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE
16 Plastic DIP
16 Plastic DIP
16 Wide SO
16 Wide SO
16 Plastic DIP
16 Plastic DIP
16 Wide SO
16 Wide SO
16 Ceramic SB
16 Ceramic SB
________________Functional Diagram
AIN ¹³
REF ¹²
MAIN DAC
Σ
CALIBRATION
DACs
COMPARATOR
4
6
VDDD
DGND
11 _VSSD
16 _VDDA
14 _AGND
15 _VSSA
2
CLK
SCLK ³
CONV ⁹
1
BP/UP/SHDN
8
CS
RESET ¹⁰
SAR
CONTROL LOGIC
MAX194
5
DOUT
THREE-STATE BUFFER
7
EOC
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