TL071H: OP selection

Brian,

There are many different op amps that can work with your photodiode. 

1. The bandwidth of the diode is specified to 0.3GHz.  To select the op amp you really need to decide what your maximum frequency is and choose an op amp with a bandwidth that can support that.  If you need over 50MHz, you will have to use a high-speed op amp.
2. In general, for photodiode applications you need to use CMOS or JFET op amps.  The reason is that bipolar op amps have bias current that is generally too high for the transimpedance amplifier.
3. Since your ADC is using a 5V supply, you should probably select an op amp with the same supply.
4. Stability is normally a significant concern with transimpedance op amp circuits.  This is because the photodiode normally has a large junction capacitance.  Your specification says Ct = 8pF.  That seems really low for a photodiode.  I normally work with PIN photodiodes.  I think you are using a different type.  That kind of makes sense because the bandwidth of your diode is quite high.  High speed amplifiers will be more sensitive to capacitance so you probably still need to consider stability.  I will attach a photodiode design reference that explains this concern in detail.
5. Another key concern with most photodiode circuits is noise.  This is a deep subject and is covered in the reference below.
6. Both the op amp and ADC really depend on what bandwidth you are trying to achieve.  If you want 0.5GHz, you will need to post this question on the high-speed amplifier forum and high-speed ADC forum.  If you don't need wide bandwidth this may not be the best photodiode for your application.  The fact that you are referencing TL071 in your request makes me think you don't need a lot of bandwidth.  
7. Possible options for ADC (ADS8860 1MHz 16 BIT SAR).  Possible op amp: OPA328, OPA320, OPA350

0647.article18-noise11-Photodiode-Noise 1.pdf

6318.article19-noise12-Photodiode-Noise 2.pdf

Best regards, Art

Brian,

As Art mentioned, the bandwidth would be very important to know here, it will determine what amplifier to recommend. You mentioned the TL07X previously, I assume because it is low cost, but there are many performance parameters that need consideration if this is more than a simple low-cost design.  Do you know what the signal bandwidth needs to be?  Art mentioned the following amplfiers also - OPA328, OPA320, OPA350; the OPA328 is the newest design with lowest IB , so I would generally chose that.  On the high-voltage side, the TLV9162 is a good choice but is only 11 MHz.  For very high frequency, you can pick OPA810 which is FET-input and 140 MHz. 

Regards,
Mike

Brian,

An FDA is only needed if the ADC input is differential.  The ADS1219 can be configured as single ended or differential.  I think you plan on using the single ended option because you mentioned you are doing a 4-channel solution.  Thus, you can drive the ADC directly with the output of your transimpedance amplifier (as you show in the bottom image).

Best regards, Art