參數(shù)資料
型號(hào): DS1852B-000
廠商: Maxim Integrated Products
文件頁(yè)數(shù): 17/26頁(yè)
文件大?。?/td> 0K
描述: IC MONITOR TXRX OPTICAL 25-BGA
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 640
類型: 收發(fā)器
電源電壓: 2.7 V ~ 5.5 V
安裝類型: 表面貼裝
封裝/外殼: 25-TFBGA,CSPBGA
供應(yīng)商設(shè)備封裝: 25-BGA(5x5)
包裝: 托盤
DS1852
24 of 26
SCALING THE ADC
procedure writeTrimValue(trim :integer); (* write trim to part *)
procedure forceReference(Vin: real); (* applies reference voltage to input pin*)
procedure waitForNewConversion(); (* writes update byte to zero and waits for
update
of new conversion with present trim *)
function readValue():integer; (* reads converted digital answer *)
procedure ProgramTrim(trim :integer);(*enables EE for table3 & programs trim*)
Procedure calVad(maxInput :real)
var
Bit
:integer; (* counter - represents bininary bit 15-0*)
trim
:integer; (* present trim values *)
lsb
:real; (* the lsb value of the voltage reading *)
Vin
:real; (* the reference input voltage *)
Dec_in :integer; (* decimal representation of voltage input *)
Dec_out :integer; (* voltage reading in decimal *)
delta
:integer; (* present error of voltage reading *)
bestDelta
:integer; (* the error closest to zero *)
bestTrim
:integer; (* the trim that gave the best delta *)
Begin
bestDelta := 1000000;
bestTrim := 0;
trim := 4095; (* 0FFFh *)
lsb := maxInput / 65535;
Dec_in := 63888; (* input is ~97.5% of full scale *)
Vin := lsb * Dec_in;
forceReference(Vin);
(*Use SAR approach to trim course adjust on VAD scale bits 15-12*)
for Bit := 15 downto 11 do (* must go 1 bit too far so that zero is
possible solution *)
begin
if (Bit > 11) then
begin
trim := trim + lshft(1,Bit);
end;
writeTrimValue(trim);
waitForNewConversion;
Dec_out := readVoltage;
delta := Dec_out - Dec_in;
if ( delta >= 0 ) then
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DS1852B-000/C 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
DS1852B-000/T&R 制造商:Maxim Integrated Products 功能描述:IC MONITOR TXRX OPTICAL 25-BGA
DS1852B-000/T&R 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
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