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Evaluation Kit for the CMX998

Evaluation Kit for the CMX998

Country/Region china

Company CML Microcircuits co. Ltd

Categories Rapid Test Kits

Update 2016-10-21 18:22:24

ICP License Issued by the Chinese Ministry

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Evaluation Kit for the CMX998


Product Data
EV9980 User Manual (rev8)


  • Allows Full Evaluation of the CMX998 IC
  • Operational Frequency Range: 100MHz to 1GHz
  • Complete Demonstration of CFBL Functionality
  • Access to RF, Control and Baseband Signals
  • Support and Interfacing for Customer PAs
  • Differential or Single-ended I and Q Inputs
  • 360 Loop Phase Shift Control
  • Can utilise PE0003 EvKit interface to work with a PC or can be used with custom interface equipment


  • For the Evaluation, Demonstration and Design-In of the CMX998

Supply Requirement:

  • 7.2V (typ) power supply
  • 1.2V and 3.6V for on-board RF PA

The EV9980 EvKit allows rapid and full evaluation of the CMX998 Cartesian Feedback Transmitter IC.

In the form of a populated PCB, this flexible platform enables users, using a control interface, to configure and evaluate the CMX998 to various applications and frequency bands.

Access is provided to all CMX998 RF, baseband and control signals by either connector or test points. Test access points are available to accept common test equipments such as RF and baseband signal generators and spectrum analysers.

All signal paths are matched by suitable components and the EvKit provides a power amplifier (PA) device at 450MHz which can be modified to provide operation at 800MHz. The EvKit can also be configured for an external PA. The overall operating evaluation frequency range of the EvKit is for RF frequencies between 100MHz and 1GHz.

The EV9980 can be configured to work with the CMX981 Digital Radio Baseband processor IC, standard test equipment or with a custom baseband system.

No software is required for use of the EvKit; the on-board CMX998 is controlled via its C-BUS serial interface and control system. This can be controlled by a PE0003 interface card (available separately) or, alternatively, a custom C-BUS interface and control system can be used.

PCB Image

Design Support Information

  • FAQs
  • Knowledge Base
EV9980 FAQ

Q. When using the CMX998 Cartesian loop IC with its evaluation kit (EV9980) I have seen degradation in carrier leakage when I enable the RF detector after the DC calibration phase.
What can I do to ensure a stable carrier leakage when I enable the RF detector?

A. In some configurations of the EV9980 the DC offset adjustment appears degraded when DCMEAS is set to "0" to "1".
That is to say when the RF detector output is connected to the DCMEAS pin following a DC calibration procedure. The cause of this is internal offsets that result in a small, (nominally 5mV), shift in VREF and BVREF when the change is made.
The effect is shown in Table 1 (below):

DC OnRF Det.DCMEASCarrier leakage with DC offset adjusted on
RV1/RV2 with Fixed bias offset
(Note 1)
Carrier leakage with DC offset adjusted on
RV1/RV2 with BVREF used for bias offset
(Note 2)
100-33dBm (-63dBc)-26dBm (-56dBc)
110-33dBm (-63dBc)-27dBm (-57dBc)
010-24dBm (-54dBc)-27dBm (-57dBc)
011-4dBm (-34dBc)-22dBm (-52dBc)
111-4dBm (-34dBc)-22dBm (-53dBc)
001-23dBm (-53dBc)-28dBm (-58dBc)

Table 1 - Carrier leakage achieved with for various conditions of DCMEAS and associated control signals, PA enabled (+30dBm mean power with modulation), 450MHz, Divide by 2 LO.

The transmitter is configured for +30dBm mean output power, TETRA pi/4-DQPSK or two-tone modulation, so a carrier null of 33dBm is -63dBc, where 'c' is based on the mean signal power.
When DCMEAS = '1' and the RF detector is enabled a degradation in carrier offset is observed with a previously adjusted carrier-null. This effect can be avoided by using BVREF to bias the input signal rather than using a resistor network tied to 3.3V.

With PCB555D in 'Mod State' 3 or 5 the BVREF signal is already used to bias

Product Tags:

fire detector test equipment


spectrum analyser software


r&s signal generator

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