參數(shù)資料
型號(hào)： BUF20820AIDCPR
英文描述： 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels
中文描述： 18通道伽瑪雙通道可編程的VCOM電壓發(fā)生器
文件頁(yè)數(shù)： 8/32頁(yè)
文件大?。?/td> 1826K
代理商： BUF20820AIDCPR
"#$%&$%
SBOS330C DECEMBER 2005 REVISED OCTOBER 2006
www.ti.com
8
DATA RATES
The two-wire bus operates in one of three speed modes:
Standard: allows a clock frequency of up to 100kHz;
Fast: allows a clock frequency of up to 400kHz; and
High-speed mode (or Hs mode): allows a clock
frequency of up to 3.4MHz.
The BUF20820 is fully compatible with all three modes. No
special action is required to use the device in Standard or
Fast modes, but High-speed mode must be activated. To
activate High-speed mode, send a special address byte of
00001xxx, with SCL = 400kHz, following the START
condition;
xxx
are bits unique to the Hs-capable master,
which can be any value. This byte is called the Hs master
code. (Note that this is different from normal address
bytes—the low bit does not indicate read/write status.) The
BUF20820 will respond to the High-speed command
regardless of the value of these last three bits. The
BUF20820 will not acknowledge this byte; the
communication protocol prohibits acknowledgement of
the Hs master code. On receiving a master code, the
BUF20820 will switch on its Hs mode filters, and
communicate at up to 3.4MHz. Additional high-speed
transfers may be initiated without resending the Hs mode
byte by generating a repeat START without a STOP. The
BUF20820 will switch out of Hs mode with the next STOP
condition.
GENERAL CALL RESET AND POWER-UP
The BUF20820 responds to a General Call Reset, which
is an address byte of 00h (0000 0000) followed by a data
byte of 06h (0000 0110). The BUF20820 acknowledges
both bytes. Upon receiving a General Call Reset, the
BUF20820 performs a full internal reset, as though it had
been powered off and then on. It always acknowledges the
General Call address byte of 00h (0000 0000), but does
not acknowledge any General Call data bytes other than
06h (0000 0110).
The BUF20820 automatically performs a reset upon
power-up. As part of the reset, the BUF20820 is configured
for all outputs to change to the programmed OTP memory
values, or (V
REFH
V
REFL
)/2 if the OTP values have not
been programmed.
The BUF20820 resets all outputs to the OTP memory
values (or to (V
REFH
V
REFL
)/2 if the OTP values have not
been programmed) when the device address is sent,
followed by a valid DAC address with bits D7 to D5 set to
‘100’. If these bits are set to ‘010’, only the DAC being
addressed will be reset.
OUTPUT VOLTAGE
Buffer output values are determined by the reference
voltages (V
REFH
and V
REFL
) and the decimal value of the
binary input code used to program that buffer. The value is
calculated using Equation 1:
V
OUT
V
REFH
V
REFL
1024
Decimal Value of Code
V
REFL
The valid voltage ranges for the reference voltages are:
4V
V
REFH
V
S
0.2V and 0.2V
V
REFL
V
S
4V
The BUF20820 outputs are capable of a full-scale voltage
output change in typically 5
μ
s—no intermediate steps are
required.
OUTPUT LATCH
Updating the DAC register is not the same as updating the
DAC output voltage, because the BUF20820 features a
double-buffered register structure. There are three
methods for latching transferred data from the storage
registers into the DACs to update the DAC output
voltages.
Method 1 requires externally setting the latch pin (LD)
LOW, LD = LOW, which will update each DAC output
voltage whenever its corresponding register is updated.
Method 2 externally sets LD = HIGH to allow all DAC
output voltages to retain their values during data transfer
and until LD = LOW, which will then simultaneously update
the output voltages of all DACs to the new register values.
Use this method to transfer a future data set in advance to
prepare for a very fast output voltage update.
Method 3 uses software control. LD is maintained HIGH,
and all DACs are updated when the master writes a 1 in bit
15 and a 0 in bit 14 of any DAC register. The update will
occur
after
receiving
the
currently-written register.
16-bit data for the
The General Call Reset and the power-up reset will update
the DAC regardless of the state of the latch pin.
(1)
(2)
相關(guān)PDF資料
PDF描述
BUF20820AIDCPRE4 18-Channel GAMMA VOLTAGE GENERATOR with Two Programmable VCOM Channels
BUF298AF TRANSISTOR | BJT POWER MODULE | INDEPENDENT | 450V V(BR)CEO | 50A I(C)
BUF298AV TRANSISTOR | BJT POWER MODULE | INDEPENDENT | 450V V(BR)CEO | 50A I(C)
BUF298F TRANSISTOR | BJT POWER MODULE | INDEPENDENT | 450V V(BR)CEO | 50A I(C)
BUF298V TRANSISTOR | BJT POWER MODULE | INDEPENDENT | 450V V(BR)CEO | 50A I(C)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
BUF20820AIDCPRE4 功能描述:LCD Gamma緩沖器 18-Ch Vltg Generator w/2 Prog VCOM Chs RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube
BUF20820EVM 功能描述:放大器 IC 開(kāi)發(fā)工具 BUF20800-BUF20820 Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
BUF22821 制造商:TI 制造商全稱:Texas Instruments 功能描述:Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory
BUF22821AIDCPR 功能描述:LCD Gamma緩沖器 Prgrmbl Gam-Vltg Gen & Vcom Calibrator RoHS:否 制造商:Maxim Integrated 輸入補(bǔ)償電壓: 轉(zhuǎn)換速度: 電源電壓-最大:20 V 電源電壓-最小:9 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-38 封裝:Tube
BUF22821EVM 功能描述:放大器 IC 開(kāi)發(fā)工具 BUF22821EVM Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評(píng)估:IR4302 工作電源電壓:13 V to 23 V
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