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参数资料
| 型号： | AT76C651 |
| 厂商： | ATMEL CORP |
| 元件分类： | 消费家电 |
| 英文描述： | Digital Reception/Transmission Integrated DVB compliant QAM Demodulator(兼容DVB的正交振幅调制解调电路) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封装： | TQFP-100 |
| 文件页数： | 25/37页 |
| 文件大小： | 497K |
| 代理商： | AT76C651 |
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AT76C651
25
AGC1NMAX: 0x14 (read/write)
Specifies the maximum (or minimum) amplification value of
AGC1 given by the PWM output pin, which is between 0
and 255 when BBCFG(4) = 0 or BBCFG(4) = 1. For more
details about the BBCFG register, see the description
below. This value can be used to saturate amplification in
case of non-linearities of the amplifier at extreme values.
Example:
0xFF (for maximum amplifying range)
BBCFG: 0x15 (read/write)
General control of IF to BB conversion. This register con-
trols several parameters of the AGC1 control loop, internal
DC-offset compensation and AGC output format.
b7
b6
b5
b4
res: Reserved (must be configured with 0 when writing
register)
dccon: DC-offset control. If set to 0, the internal DC-
offset compensation is ON. If set to 1, the internal DC-
offset control is OFF. The DC-offset should be ON when
the input signal is in BB.
sgnam: Sign of the amplifier control command (see
Figure 14)
Figure 14.
sgnam Configuration for Amplifier Gain Control
adccon: Specifies whether ADCLEVEL must be
automatically adapted in the presence of adjacent
channels or if it must keep its initial value defined by
register AGC1INITADC. Automatic adaptation is
configured by 0; no adaptation is configured by 1.
pwmcon: Specifies output format for AGC and CSTPWM
pins. If set to 0, the AGC control is output in PWM format
on AGC pin, and a completely configurable value (see
CSTPWM register) is output in PWM format on
CSTPWM pin. If set to 1, the AGC control is output in
differential format on AGC and CSTPWM pins. In this
case, differential integration must be performed in the
analog domain.
In case of a PWM output, the AGC pin should be con-
nected to an RC filter with a cut-off frequency of maximum
1 kHz.
Example:
R = 1.5 k
, C = 1 μF
Note:
The PWM output pin can be power supplied by 5V
through the I2CVDD power supply. This assumes I
2
C
bus functions at 5V.
CSTPWM: 0x17 (read/write)
Specifies a configurable value between 0 and 255, which is
given in PWM format on CSTPWM pin in case BBCFG(1) =
0. The CSTPWM pin should be connected to an RC filter
with a cut-off frequency of maximum 1 kHz.
Example:
R = 1.5 k
, C = 1 μF
This voltage output can be used to control any other device
on the board, like other amplifier gain control, variable
capacitor, etc.
Note:
This pin can output 5V since it is power-supplied by the
I2CVDD power supply (this assumes I
2
C bus functions
at 5V).
b7
b6
b5
b4
Example:
cstpwm = 0x7F (2.5V in case 5V is connected to I2CVDD)
BBTOPCNT: 0x19 (read)
This monitoring register indicates the number of A/D satu-
rations over 16384 successive samples. This register can
take values between 0 and 255. 255 indicates that more
than 255 A/D saturations have occurred during the last
16384 samples.
When the demodulator is working properly, this value
should indicate 0x00.
agc1nmax
0x14
b7
b6
b5
b4
b3
b2
b1
b0
res
res
dc
con
sgn
am
0x15
b3
b2
b1
b0
adc
con
res
pwm
con
res
A
Control Voltage
sgnam = 0
sgnam = 1
cstpwm
0x17
b3
b2
b1
b0
bbtopcnt
0x19
b7
b6
b5
b4
b3
b2
b1
b0
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