ISL5416KIZ datasheet(9/71 Pages) INTERSIL

Part #	ISL5416KIZ

Description	Four-Channel Wideband Programmable DownConverter

Download	71 Pages

Scroll/Zoom	100%

Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

Logo

9 / 71 page

9

ISL5416

VGA/RF Attenuator (A/D Range Control)

The range control section monitors the output of the A/D and

adjusts the RF/IF gain to maintain a desired A/D output

range. The gain adjustments are in 6 dB steps. The levels,

adjustment rates, and gain to bit mapping are

programmable.

The range control section uses three programmable

thresholds. Two thresholds, an upper and a lower threshold,

are compared against the average magnitude of the A/D

output. The range control adjusts the gain to keep the

average A/D output between the upper and lower thresholds.

If the average is above the upper threshold, an internal

attenuator control register is increased by a programmable

amount. If the average is below the lower threshold, the gain

attenuator control register is decreased by a separate

programmed amount. The number of samples averaged for

each decision is programmable. The adjustments to the

attenuator control register can be less than 6 dB to further

filter the inputs. Only the three MSBs of the attenuator

control register are used to control the RF/IF gain, and these

are weighted as 6, 12, 24 dB steps.

The third threshold, an immediate threshold, is compared

against the magnitude of each A/D sample. If the magnitude

of any A/D sample exceeds the threshold, the attenuator

control register is immediately increased by the amount

programmed for the immediate threshold. Because there will

be some time delay from a register change until the effect of

the change is seen at the A/D, the immediate threshold is

disabled for a programmable number of clock cycles after it

has been triggered.

To maximize the input sensitivity the range control also

includes a programmable bias. If the average signal is

between the upper and lower threshold, the bias value is

added from the attenuator control register. This bias

removes attenuation when it is no longer needed to avoid

missing small signals due to high input noise figure.

Four counters control the amount of time that the input is

averaged and align the adjustments to time slot boundaries.

One counts out the time slot period. If desired, this counter

can be reset by a SYNCInX signal to align its count to the

system timing. A second counter provides a programmable

delay from the start of the first counter's period to the start of

the integration period. This compensates for system delays

or allows the adjustments to be made over a certain portion

of the time slot. The third counter sets the integration period

for averaging the input samples for the upper and lower

threshold decisions. The fourth counter controls the number

of integration periods per time slot. See Figure 2 for a block

diagram. Note that the counters are ignored for the

immediate threshold decisions.

The user can program a separate code for output on the

EOUT bus for each of the eight possible states of the three

MSBs of the attenuator control register. These codes can be

up to 8 bits, but if four gain control sections are used, only

four bits are available for each gain control section. The

mapping of the gain control bits to EOUT bits is done in

GWA = 0001h and the codes are programmed in IWA =

0*17h and 0*18h.

The three MSBs of the attenuator control register can be

routed internally to the channels to be used as the floating-

point exponents. This adds gain in 6 dB steps to compensate

for the 6 dB steps of RF attenuator. The MSBs can be added

to the input exponent bits if desired. There is a

programmable delay from the attenuator control register to

the channel input to compensate for RF/IF filter group delay

and A/D and ISL5416 pipeline delays.

Similar Part No. - ISL5416KIZ

Manufacturer	Part #	Datasheet	Description
Intersil Corporation	ISL5416KIZ	1Mb / 71P	Four-Channel Wideband Programmable August 2004
Renesas Technology Corp	ISL5416KIZ	2Mb / 71P	Four-Channel Wideband Programmable DownConverter

More results

Similar Description - ISL5416KIZ

Manufacturer	Part #	Datasheet	Description
Intersil Corporation	ISL5416	1Mb / 71P	Four-Channel Wideband Programmable DownConverter
Renesas Technology Corp	ISL5416	2Mb / 71P	Four-Channel Wideband Programmable DownConverter
Intersil Corporation	HSP50216	786Kb / 58P	Four-Channel Programmable Digital Downconverter
Intersil Corporation	ISL5216KI	971Kb / 65P	Four-Channel Programmable Digital Downconverter July 13, 2007
Renesas Technology Corp	HSP50216	1Mb / 59P	Four-Channel Programmable Digital Downconverter October 5, 2015
Intersil Corporation	ISL5216	1Mb / 65P	Four-Channel Programmable Digital DownConverter
Intersil Corporation	HSP50216	767Kb / 58P	Four-Channel Programmable Digital DownConverter
Renesas Technology Corp	ISL5216	2Mb / 65P	Four-Channel Programmable Digital Downconverter
Intersil Corporation	HSP50216	561Kb / 53P	Four-Channel Programmable Digital DownConverter
Intersil Corporation	ISL5216	969Kb / 65P	Four-Channel Programmable Digital Downconverter

More results

ISL5416KIZ Datasheet(PDF) 9 Page - Intersil Corporation

ISL5416KIZ Datasheet(HTML) 9 Page - Intersil Corporation

Similar Part No. - ISL5416KIZ

Similar Description - ISL5416KIZ

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71

Datasheet Download

Link URL