MAX550BC/D Просмотр технического описания (PDF) - Maxim Integrated
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MAX550BC/D Datasheet PDF : 12 Pages
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Low-Power, +2.5V to +5.5V, 8-Bit
Voltage-Output DAC in µMAX
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
1
GND
Ground
2
OUT
DAC Output Voltage
3
CS
Chip-Select Input. A logic low on CS enables serial data to be clocked into the input shift
register. Programming commands are executed at CS’s rising edge.
4
DIN
Serial Data Input. Data is clocked into the 16-bit input shift register on SCLK’s rising edge.
5
SCLK
Serial Clock Input. Data is clocked in on SCLK’s rising edge.
6
VDD2
Connect to VDD1
7
REF
External Reference Voltage Input for DAC (2.5V to VDD_)
8
VDD1
Positive Power Supply (+2.5V to +5.5V)
R
R
R
R
R
R
R
2R
2R
2R
2R
2R
2R
2R
2R
2R
REF
GND
LSB
NOTE: SWITCH POSITIONS SHOWN FOR DAC CODE FF HEX.
Figure 1. DAC Simplified Circuit Diagram
DAC REGISTER
OUT
GND
MSB
_______________Detailed Description
Analog Section
The MAX550B is an 8-bit, voltage-output digital-to-ana-
log converter (DAC). The DAC consists of an R-2R lad-
der network that converts 8-bit digital inputs into
equivalent analog output voltages in proportion to the
applied reference voltage (Figure 1). The MAX550B’s
output is unbuffered and has a typical output resis-
tance of 32kΩ. The power-supply range is from +2.5V
to +5.5V.
Reference Input
The voltage applied at REF sets the full-scale output for
the DAC and may range from 2.5V to VDD_. The REF
input resistance is code-dependent, with the lowest
value (typically 32kΩ) occurring when the DAC register
is loaded with a code of 01010101 (55 hex). To mini-
mize INL errors, the reference voltage source should
have less than 6Ω output impedance.
6 _______________________________________________________________________________________
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