- 您現在的位置：買賣IC網 > PDF目錄374016 > ADMCF340 (Analog Devices, Inc.) DashDSPTM 64-Lead Flash Mixed-Signal DSP with Enhanced Analog Front End PDF資料下載
參數資料
| 型號： | ADMCF340 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | DashDSPTM 64-Lead Flash Mixed-Signal DSP with Enhanced Analog Front End |
| 中文描述： | DashDSPTM 64無鉛閃存混合信號增強的DSP與模擬前端 |
| 文件頁數： | 16/40頁 |
| 文件大小： | 415K |
| 代理商： | ADMCF340 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁當前第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁
REV. 0
ADMCF340
–16–
In general, the on-times of the PWM signals in double update
mode are defined by:
T
AH
= (
PWMCHA
1
+
PWMCHA
2
–
PWMDT
1
–
PWMDT
2
)
×
T
CK
T
AL
= (
PWMTM
1
+
PWMTM
2
–
PWMCHA
1
–
PWMCHA
2
–
PWMDT
1
–
PWMDT
2
)
×
T
CK
d
T
T
PWMCHA
PWMTM
PWMCHA
PWMTM
PWMDT
PWMTM
PWMDT
PWMTM
d
T
T
PWMTM
PWMTM
PWMCHA
PWMTM
PWMTM
PWMCHA
PWMDT
+
1
PWMDT
PWMTM
PWMTM
AH
AH
S
AL
AL
S
=
=
+
+
+
+
=
=
+
+
(
)
+
+
+
(
)
1
2
1
2
1
2
1
2
1
2
1
1
2
2
1
2
2
–
because of the completely general case in double update mode,
the switching period is given by:
T
PWNMTM
PWMTM
T
S
CK
=
+
(
)
×
1
2
Again, the values of
T
AH
and
T
AL
are constrained to lie between
zero and
T
S
.
PWM signals similar to those illustrated in Figure 7 and Figure 8 can
be produced on the BH, BL, CH, and CL outputs by programming
the PWMCHB and PWMCHC Registers in a manner identical
to that described for PWMCHA.
The PWM controller does not produce any PWM outputs until
all of the PWMTM, PWMCHA, PWMCHB, and PWMCHC
Registers have been written to at least once. After these registers
have been written, the counters in the three-phase timing unit
are enabled. Writing to these registers also starts the main PWM
timer. If during initialization, the PWMTM Register is written
before the PWMCHA, PWMCHB, and PWMCHC Registers, the
first PWMSYNC pulse (and interrupt if enabled) will be generated
(1.5
×
T
CK
×
PWMTM) seconds after the initial write to the
PWMTM Register in single update mode. In double update mode,
the first PWMSYNC pulse will be generated (T
CK
×
PWMTM)
seconds after the initial write to the PWMTM Register in single
update mode.
Effective PWM Resolution
In single update mode, the same values of PWMCHA, PWMCHB,
and PWMCHC are used to define the on-times in both half
cycles of the PWM period. As a result, the effective resolution of
the PWM generation process is 2 T
CK
(or 100 ns for a 20 MHz
CLKOUT) since incrementing one of the duty cycle registers by
one changes the resultant on-time of the associated PWM signals
by T
CK
in each half period (or 2 T
CK
for the full period).
In double update mode, improved resolution is possible since
different values of the duty cycle registers are used to define the
on-times in both the first and second halves of the PWM period.
As a result, it is possible to adjust the on-time over the whole
period in increments of T
CK
. This corresponds to an effective
PWM resolution of T
CK
in double update mode (or 50 ns for a
20 MHz CLKOUT).
Table IV. Fundamental Characteristics of PWM Generation Unit of ADMCF340
16-BIT PWM TIMER
Parameter
Min
Typ
Max
Unit
Counter Resolution
Edge Resolution (Single Update Mode)
Edge Resolution (Double Update Mode)
Programmable Dead Time Range
Programmable Dead Time Increments
Programmable Pulse Deletion Range
Programmable Pulse Deletion Increments
PWM Frequency Range
PWMSYNC Pulsewidth (T
CRST
)
Gate Drive Chop Frequency Range
16
100
50
Bits
ns
ns
μ
s
ns
μ
s
ns
Hz
μ
s
MHz
0
102
100
0
50
51
153
0.05
0.02
12.8
5
相關PDF資料 |
PDF描述 |
|---|---|
| ADMCF340BST | DashDSPTM 64-Lead Flash Mixed-Signal DSP with Enhanced Analog Front End |
| ADMCF340-EVALKIT | Circular Connector; No. of Contacts:7; Series:MS27497; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:10; Circular Contact Gender:Pin; Circular Shell Style:Wall Mount Receptacle; Insert Arrangement:10-99 RoHS Compliant: No |
| ADMCF341 | DashDSP⑩ 28-Lead Flash Mixed-Signal DSP with Enhanced Analog Front End |
| ADMCF341BR | DashDSP⑩ 28-Lead Flash Mixed-Signal DSP with Enhanced Analog Front End |
| ADMCF341-EVALKIT | DashDSP⑩ 28-Lead Flash Mixed-Signal DSP with Enhanced Analog Front End |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADMCF340BST | 制造商:AD 制造商全稱:Analog Devices 功能描述:DashDSPTM 64-Lead Flash Mixed-Signal DSP with Enhanced Analog Front End |
| ADMCF340-EVALKIT | 制造商:AD 制造商全稱:Analog Devices 功能描述:DashDSPTM 64-Lead Flash Mixed-Signal DSP with Enhanced Analog Front End |
| ADMCF340XSTB | 制造商:Analog Devices 功能描述: |
| ADMCF341 | 制造商:AD 制造商全稱:Analog Devices 功能描述:DashDSP⑩ 28-Lead Flash Mixed-Signal DSP with Enhanced Analog Front End |
| ADMCF341BR | 制造商:Analog Devices 功能描述:DSP Fixed-Point/Floating-Point 16-Bit 20MHz 20MIPS 28-Pin SOIC W T/R |
發布緊急采購，3分鐘左右您將得到回復。