LTC6603 Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LTC6603 Datasheet PDF : 24 Pages
| |||
LTC6603
APPLICATIONS INFORMATION
5V
C7
100nF
LTC6078
2 –IN V+ 1 2
3
OUT
+IN
V–
–INB +INB
I RANGE = 6μA TO 38.4μA
USE NARROW SHORT
TRACES FOR MINIMUM
R23 R24
50k
50k
CAPACITANCE.
Q1
RK7002AT116CT
VOCM
R1
30.5k
5V
LTC6078
V+
7 –IN
OUT+IN
V–
5V
R4
100k
C8
100nF
C16
50pF
C17
50pF
VREF VCC
SDO
1
2
7
VOUT
SDI 3
LTC2621-1
SCK
CLR
CS/LD
GND LDAC
4
5
10
5V
C9
1μF
5V
V+IN
C1
100nF
C2
2.2μF
3V
V+
+INA
–INA
R25
R26
C3
C4
50k
50k
2.2μF
100nF
1
24
2 V+IN
+INA
23
3 V+A
–INA 22
4 VOCM
GAIN1
21
5 RBIAS
GAIN0(D0) 20
CLKCNTL
6 LPF1(CS)
VOCM CAP 19
+OUTA
7
18
+INB
8
–INB
LTC6603
–OUTA
SER 17
9
16
10 LPF0(SCLK)
V+D 15
SDI
CLK IO
11
14
SDO
GND
12
13
–OUTB
+OUTB
6603 F06
SPI INTERFACE
SDI
SCLK
CS
C18
C19
50pF
50pF
C15
10nF
+OUTA
–OUTA
+OUTB
–OUTB
CLR LOW WILL SET DAC TO MID-SCALE (WITH A –1 VERSION).
HAS ~100ms TC AT START-UP TO RESET TO ZERO SCALE.
DATA FORMAT
DATA IS SHIFTED FROM MOSI (MASTER OUT, SLAVE IN) THRU LTC6603 INTO THE LTC2621.
THE TOTAL PACKET IS 32 BITS. IT STARTS WITH A CONTROL BYTE (0011 XXXX) THEN MSB OF THE DAC,
WITH DUMMY BITS AT THE END, 16 BITS (24 BITS TOTAL). THEN 8 BITS TO THE FILTER.
D6 & D7 = GAIN, D4 & D5 = LPF, D1 = SHDN. D0 = GEN. PURPOSE OUTPUT.
Figure 6. Current Controlled Clock Frequency
10
0
–10
–20
–30
–40
–50
–60
–70 VS = 3V
–80 TA = 25°C
1k
10k
100k
1M
FREQUENCY (Hz)
10M
6603 F07
Figure 7. Frequency Response Controlled by LTC2621-1
RBIAS
VCONTROL –+
RBIAS
fCLK = 247.2MHz • (10k/RBIAS) • (1 – VCONTROL/1.17V)
6603 F08
Figure 8. Voltage Controlled Clock Frequency
6603f
17
Share Link: 