Features: • DAVIC MMDS V1.1 and V1.3 compliant• Supports 16, 64 and 256QAM• Supports 16, 64 and 256 TCM• Internal 8-bit ADC• Interface for 10-bit external ADC• 36.125MHz nominal IF input• Symbol rate range 5 5.304Mbaud in 6MHz channels• Integrated m...
CXD1958Q: Features: • DAVIC MMDS V1.1 and V1.3 compliant• Supports 16, 64 and 256QAM• Supports 16, 64 and 256 TCM• Internal 8-bit ADC• Interface for 10-bit external ADC• 36...
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Description |
Symbol |
Condition |
MIN. |
MAX. |
UNIT |
Digital power supply |
DVDD |
|
DVss 0.5 |
+4.6 |
V |
Analog power supply |
AVDD |
|
AVss 0.5 |
+4.6 |
V |
Input voltage: 3.3V only |
VI |
Pins TRST, TDI, TMS, TCK, A1,A0, VRT, VIN, VRB, XTALI |
DVss 0.5 |
DVDD + 0.5 |
V |
Output voltage: 3.3V only |
VO |
Pins TEVAL[9:0], TDO, TVALID, TSLOCK, TSERR, TSDATA[7:0], |
DVss 0.5 |
DVDD + 0.5 |
V |
Storage temperature |
TSTG |
|
55 |
+150 |
°C |
The CXD1958Q is an integrated TCM/QAM demodulator for MMDS systems using the DAVIC MMDS standard. This highly integrated device incorporates an internal 8-bit ADC, image rejection and root-raised cosine filters, all-digital symbol timing recovery PLL, adaptive decision feedback equalizer (DFE) with 10 feedforward and 30 feedback taps, 4-D TCM decoder, and DAVIC/DVB compliant forward error correction comprising (204,188) Reed Solomon decoder, a programmable de-interleaver with I = 12 and I = 204, and a de-randomiser. All internal clocks are generated from a single external 30MHz reference crystal.
Device functionality CXD1958Q also includes 3-wire bus interface for configuring up to 2 tuner synthesizers, a sigma delta tuner IF-AGC output, a user programmable RFAFC sigma delta output, spectrum inversion of the received signal for tuner compatibility, and a highly configurable MPEG2-TS interface. An I2C bus interface provides on-board configuration and status monitoring of various functions including access to the equalizer tap values and constellation points. JTAG provides boundary scan test compatibility.