參數(shù)資料
型號： TC1321
廠商： Microchip Technology Inc.
英文描述： 10-Bit Digital-to-Analog Converter with Two-Wire Interface
中文描述： 10位數(shù)字到模擬轉(zhuǎn)換器兩線接口
文件頁數(shù)： 6/16頁
文件大小： 446K
代理商： TC1321
TC1321
DS21387B-page 6
2002 Microchip Technology Inc.
3.0
DETAILED DESCRIPTION
The TC1321 is a monolithic 10-bit digital-to-analog
converter that is designed to operate from a single sup-
ply that can range from 2.7V to 5.5V. The DAC consists
of a data register (DATA), a configuration register
(CONF), and a current output amplifier. The TC1321
uses an external reference which also determines the
maximum output voltage.
The TC1321 uses a current steering DAC based on an
array of matched current sources. This current, along
with a precision resistor, converts the contents of the
Data Register and V
REF
into an output voltage, V
OUT
given by:
V
OUT
= V
REF
(DATA/1024)
3.1
Reference Input
The reference pin, V
REF
, is a buffered high-impedance
input and because of this, the load regulation of the ref-
erence source needs only to be able to tolerate leakage
levels of current (less than 1
μ
A). V
REF
accepts a volt-
age range from 0 to (V
DD
– 1.2V). Input capacitance is
typically 10pF.
3.2
Output Amplifier
The TC1321 DAC output is buffered with an internal
unity gain rail-to-rail input/output amplifier with a typical
slew rate of 0.8V/
μ
sec. Maximum full scale transition
settling time is 10
μ
sec to within ±1/2LSB when loaded
with 1k
in parallel with 100pF.
3.3
Standby Mode
The TC1321 allows the host to put it into a Low Power
(I
DD
= 0.5
μ
A, typical) Standby mode. In this mode, the
D/A conversion is halted. The SMBus port operates
normally. Standby mode is enabled by setting the
SHDN bit in the CONFIG register. The table below
summarizes this operation.
TABLE 3-1:
STANDBY MODE OPERATION
3.4
SMBus Slave Address
The TC1321 is internally programmed to have a default
SMBus address value of
1001 000b
. Seven other
addresses are available by custom order (contact fac-
tory). See Figure 3-1 for location of address bits in
SMBus protocol.
SHDN Bit
Operating Mode
0
1
Normal
Standby
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