Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

AD7568BS Scheda tecnica(PDF) 9 Page - Analog Devices

Il numero della parte AD7568BS
Spiegazioni elettronici  LC2MOS Octal 12-Bit DAC
Download  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7568BS Scheda tecnica(HTML) 9 Page - Analog Devices

Back Button AD7568BS Datasheet HTML 4Page - Analog Devices AD7568BS Datasheet HTML 5Page - Analog Devices AD7568BS Datasheet HTML 6Page - Analog Devices AD7568BS Datasheet HTML 7Page - Analog Devices AD7568BS Datasheet HTML 8Page - Analog Devices AD7568BS Datasheet HTML 9Page - Analog Devices AD7568BS Datasheet HTML 10Page - Analog Devices AD7568BS Datasheet HTML 11Page - Analog Devices AD7568BS Datasheet HTML 12Page - Analog Devices  
Zoom Inzoom in Zoom Outzoom out
 9 / 12 page
background image
AD7568
REV. B
–9–
Current Mode Circuit
In the current mode circuit of Figure 17, IOUT2, and hence
IOUT1, is biased positive by an amount VBIAS. For the circuit to
operate correctly, the DAC ladder termination resistor must be
connected internally to IOUT2. This is the case with the AD7568.
The output voltage is given by:
VOUT = D
RFB
RDAC
V BIAS −V IN
()
{}+V
BIAS
As D varies from 0 to 4095/4096, the output voltage varies from
VOUT = VBIAS to VOUT = 2 VBIAS – VIN. VBIAS should be a low
impedance source capable of sinking and sourcing all possible
variations in current at the IOUT2 terminal without any
problems.
Voltage Mode Circuit
Figure 18 shows DAC A of the AD7568 operating in the
voltage-switching mode. The reference voltage, VIN is applied to
the IOUT1 pin, IOUT2 is connected to AGND and the output volt-
age is available at the VREF terminal. In this configuration, a
positive reference voltage results in a positive output voltage
making single supply operation possible. The output from the
DAC is a voltage at a constant impedance (the DAC ladder re-
sistance). Thus, an op amp is necessary to buffer the output
voltage. The reference voltage input no longer sees a constant
input impedance, but one which varies with code. So, the volt-
age input should be driven from a low impedance source.
It is important to note that VIN is limited to low voltages be-
cause the switches in the DAC no longer have the same source-
drain voltage. As a result, their on-resistance differs and this
degrades the integral linearity of the DAC. Also, VIN must not
go negative by more than 0.3 volts or an internal diode will turn
on, causing possible damage to the device. This means that the
full-range multiplying capability of the DAC is lost.
DAC A
A1
I
A
OUT1
I
A
OUT2
AD7568
V
OUT
R
A
FB
V
A
REF
V
IN
NOTES
1) ONLY ONE DAC IS SHOWN FOR CLARITY.
2) DIGITAL INPUT CONNECTIONS ARE OMITTED.
3) C1 PHASE COMPENSATION (5–15pF) MAY BE
REQUIRED WHEN USING HIGH SPEED AMPLIFIER, A1.
R1
R2
Figure 18. Single Supply Voltage Switching
Mode Operation
APPLICATIONS
Programmable State Variable Filter
The AD7568 with its multiplying capability and fast settling
time is ideal for many types of signal conditioning applications.
The circuit of Figure 19 shows its use in a state variable filter
design. This type of filter has three outputs: low pass, high pass
and bandpass. The particular version shown in Figure 19 uses
one half of an AD7568 to control the critical parameters f0, Q
and A0. Instead of several fixed resistors, the circuit uses the
DAC equivalent resistances as circuit elements. Thus, R1 in
Figure 19 is controlled by the 12-bit digital word loaded to
DAC A of the AD7568. This is also the case with R2, R3 and
R4. The fixed resistor R5 is the feedback resistor, RFBB.
DAC Equivalent Resistance, REQ = (RLADDER
4096)/N
where:
RLADDER is the DAC ladder resistance.
N is the DAC Digital Code in Decimal (0 < N < 4096).
DAC A
(R1)
DAC B
(R2)
1/2 x AD7568
A1
A1
R8 30k
HIGH
PASS
OUTPUT
DAC C
(R3)
I
A
OUT1
I
C
OUT1
R
B
FB
V
B
REF
V
IN
I
B
OUT1
V
C
REF
DAC D
(R4)
C3 10pF
C1 1000pF
R7 30k
C1 1000pF
LOW
PASS
OUTPUT
BAND
PASS
OUTPUT
V
A
REF
I
C
OUT2
I
B
OUT2
I
A
OUT2
I
D
OUT2
V
D
REF
I
D
OUT1
A2
A3
R6
10k
NOTES
1. A1, A2, A3, A4: 1/4 x AD713
2. DIGITAL INPUT CONNECTIONS ARE OMITTED.
3. C3 IS A COMPENSATION CAPACITOR TO ELIMINATE
Q AND GAIN VARIATIONS CAUSED BY AMPLIFIER GAIN
BANDWIDTH LIMITATIONS.
Figure 19. Programmable 2nd Order State Variable Filter


Codice articolo simile - AD7568BS

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Analog Devices
AD7568BSZ AD-AD7568BSZ Datasheet
354Kb / 14P
   LC2MOS Octal 12-Bit DAC
REV. C
AD7568BSZ-REEL AD-AD7568BSZ-REEL Datasheet
354Kb / 14P
   LC2MOS Octal 12-Bit DAC
REV. C
More results

Descrizione simile - AD7568BS

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
Analog Devices
AD7568BPZ AD-AD7568BPZ Datasheet
354Kb / 14P
   LC2MOS Octal 12-Bit DAC
REV. C
AD7568BSZ AD-AD7568BSZ Datasheet
354Kb / 14P
   LC2MOS Octal 12-Bit DAC
REV. C
AD7228UQ AD-AD7228UQ Datasheet
169Kb / 8P
   LC2MOS Octal 8-Bit DAC
REV. A
AD7228KN AD-AD7228KN Datasheet
210Kb / 8P
   LC2MOS Octal 8-Bit DAC
REV. A
AD7228UQ AD-AD7228UQ Datasheet
169Kb / 8P
   LC2MOS Octal 8-Bit DAC
REV. A
AD7228KR AD-AD7228KR Datasheet
210Kb / 8P
   LC2MOS Octal 8-Bit DAC
REV. A
AD7228 AD-AD7228 Datasheet
457Kb / 16P
   LC2MOS Octal 8-Bit DAC
AD7228BQ AD-AD7228BQ Datasheet
169Kb / 8P
   LC2MOS Octal 8-Bit DAC
REV. A
AD7228LP AD-AD7228LP Datasheet
169Kb / 8P
   LC2MOS Octal 8-Bit DAC
REV. A
AD7845 AD-AD7845 Datasheet
195Kb / 12P
   LC2MOS Complete 12-Bit Multiplying DAC
REV. B
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com