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003009-UK datasheets 11-2000
MAX114/118
Integrated Circuits
Special Function
DATASHEET 11/2000
MAX114/118
Integrated Circuits
Special Function
DATASHEET 11/2000
MAX114/MAX118
+5V, 1Msps, 4 & 8-Channel, 8-Bit ADCs with 1µA
Power-Down
Features
- Single +5V Supply Operation
- 4 (MAX114) or 8 (MAX118) Analog Input Channels
- Low Power:
40mW (operating mode)
5µW (power-down mode)
- Total Unadjusted Error £1LSB
- Fast Conversion Time: 660ns per Channel
- No External Clock Required
- Internal Track/Hold
- 1MHz Full-Power Bandwidth
- Internally Connected 8th Channel Monitors Refer-
ence Voltage (MAX118)
Manufacturer
Maxim Integrated Products. Internet:
http://www.maxim-ic.com
Application Example
Gameboy Digital Sampling Oscilloscope (GBDSO),
Elektor Electronics October & November 2000
General Description
The MAX114/MAX118 are microprocessor-compati-
ble, 8-bit, 4-channel and 8-channel analog-to-digital
converters (ADCs). They operate from a single +5V
supply and use a half-flash technique to achieve a
660ns conversion time (1Msps). A power-down
(PWRDN) pin reduces current consumption typically
to 1µA. The devices return from power-down mode
to normal operating mode in less than 200ns, allowing
large supply-current reductions in burst-mode applica-
tions (in burst mode, the ADC wakes up from a low-
power state at specified intervals to sample the analog
input signals). Both converters include a track/hold,
enabling the ADC to digitize fast analog signals.
Microprocessor (µP) interfaces are simplified because
the ADC can appear as a memory location or I/O
port without external interface logic. The data out-
puts use latched, three-state buffer circuitry for direct
connection to an 8-bit parallel µP data bus or system
input port. The MAX114/MAX118 input/reference
configuration enables ratiometric operation.
The 4-channel MAX114 is available in a 24-pin DIP or
SSOP. The 8-channel MAX118 is available in a 28-pin
DIP or SSOP.
MAX114 Pin Configuration
Ordering Information
PART
TEMP. RANGE
PIN
PACKAGE
MAX114CNG
0°C to +70°C
24 Narrow
Plastic DIP
MAX114CAG
0°C to +70°C
24 SSOP
Applications
High-Speed DSP
Remote Data Acquisition
Portable Equipment
Communications Systems
MAX114C/D
0°C to +70°C
Dice
MAX114ENG
–40°C to +85°C
24 Narrow
Plastic DIP
MAX114EAG
–40°C to +85°C
24 SSOP
MAX114MRG
–55°C to +125°C
24 Narrow
CERDIP
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MAX114/118
Integrated Circuits
Special Function
DATASHEET 11/2000
MAX114/118
Integrated Circuits
Special Function
DATASHEET 11/2000
Pin Description (MAX114 only)
Pin
Name
Function
1
IN4
Analog Input Channel 4
2
IN3
Analog Input Channel 3
3
IN2
Analog Input Channel 2
4
IN1
Analog Input Channel 1
5
MODE
A current source.
MODE = 0 activates read mode; MODE = 1 activates write-read mode.
µ
6
D0
Three-State Data Output (LSB).
7, 8, 9
D1 , D2, D3 Three-State Da ta Outputs.
10
RD
Read Input. RD m ust b e low to access data.
11
INT
Interrupt Output. INT goes low to indicate end of conversion.
12
GND
Ground
13
REF–
Lower Limit of Reference Span. REF– sets the zero-code voltage.
Range is GND ≤ V REF– < V REF+ .
14
REF+
Upper Limit of Reference Span. REF+ sets the full-scale input voltage.
Range is V REF– < V REF+
≤
V DD . Internally hard-wired to IN8.
15
WR/RDY
Write-Control Inp ut/ Ready-Status Output.
16
CS
Chip-Select Input. CS must be low for the device to recognize WR or RD
inputs.
17, 18, 19
D4, D5, D6 Three-State Data Outputs.
20
D7
Three-State Data Output (MSB).
21
A1
Multiplexer Channel Address Input.
22
A0
Multiplexer Channel Address Input (LSB)
23
PWRDN
Power-Down Input. PWRDN reduces supply current when low.
24
V DD
Positive Supply, +5V.
Functional Diagram
Mode Selection Input. Internally pulled low with a 50
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